Does Hot Water Freeze Faster Than Cold Water?

Observations over millenia and numerous experiments claim that warmer water freezes faster than cold water under identical conditions.
Supported by Google Making & Science #ScienceGoals
/ makingscience
References:
Mpemba Effect: en.wikipedia.org/wiki/Mpemba_...
Questioning the Mpemba Effect: www.nature.com/articles/srep37665
Royal Society of Chemistry competition: www.rsc.org/learn-chemistry/re...
Edited by Trevor Carlee

[@Nvrmr_]

You look like that guy from Veritasium

[@ObjectsInMotion]

Nevermore Yeah it's Dirk from Veristablium

[@lucasramosp]

Nevermore Yes! His name is Dalek, he is Derek's twin.

[@user-iu1xg6jv6e]

He's Derek's evil twin!

[@AlhunAydin]

Yeah! He finally managed to clone himself.

[@VaregianEisselor]

Yeah, just like the guy from Foo Fighters looks like the drummer from Nirvana. Strange world.

[@arooobine]

Mpemba was the ultimate hipster. He froze his ice cream before it was cool.

[@bluesquare23]

Benjamin go home...

[@xl000]

Hipsters are so passé, and so are hipsters jokes. I mean it would have been funny 2/3 years ago, but nowadays I don"t even care about hipsters.

[@rich1051414]

Don't listen to these guys, puns are great :D You guys are focusing on the wrong part, the funny bit is at the end.

[@trashcat3000]

xl pfff that's so lumbersexual

[@sexybeast7728]

lol this is the second best comment i have read this year...

[@cyclesingsleep]

So, for practical purposes, the Mpemba effect can seem to happen, but in a severely controlled lab, it doesn't...unless a thermocouple is purposely misplaced...but only because we don't really understand everything that goes into the process of water freezing. Very clear...

[@rashidisw]

Well, in controlled lab its uses most pure water as possible, while in that ice cream making can we truly said it was pure water?

[@link7417]

@@rashidisw that is a fair question but for many tens and purposes the ice creams are still equal in many ways but as the last test veritasium talked about explained that even slight discrepancy can change the results for instance if you put in a few grams more or less suger for an example but things like convection could an explanation or contributer aswell

[@rylestknuckles]

@@link7417 "tens and purposes"

[@BigUriel]

@@rashidisw ​I can think of a number of significant ways in which ice cream differs from water. Ice cream is an emulsion with not only various minerals but many different organic compounds like fats and proteins which can change their structure irreversibly when heated up. Pure water heated up to 100 degrees and cooled back down is virtually indistinguishable from water that was never heated up in the first place. Try boiling ice cream and then cooling it back down, it'll never look like ice cream again.

[@dochertyinbc]

@@link7417 The phrase is "intents and purposes"

[@HostileTakeover2]

I always find these kinds of things fascinating. Something so seemingly simple turns out to be far more complicated than we know. And the moment your brain glitches when it suddenly realizes just how amazing something normally taken for granted is, that's an amazing feeling.

[@repentoryouwilllikewiseper8741]

Repent to Jesus Christ “For the eyes of the Lord are on the righteous and his ears are attentive to their prayer, but the face of the Lord is against those who do evil.”” ‭‭1 Peter‬ ‭3:12‬ ‭NIV‬‬ U

[@fredosslave7558]

@@repentoryouwilllikewiseper8741 No.

[@protercool8474]

There is always more shit going on than we can know

[@dsd-downshiftdave8056]

@@repentoryouwilllikewiseper8741 what on earth does your statement have to do with this video?

[@spoolers9090]

"I thought cold water was supposed to boil faster than hot water" -some hell's kitchen episode

[@lesliee.4525]

That's why I'm here lol

[@cs2dailycaseopenings]

@@lesliee.4525 Dude same lol

[@JustARegularEverydayNormalGuy]

😂😂i am here becoz of that

[@flare439]

yo wtf. i just watched that clip a while ago, and for some "reason" this pop up in my recommendation. KZbin is surely spying on us.

[@cs2dailycaseopenings]

@@sentane8031 Got you m8

[@renz1013]

I was recommended this because of that hell's kitchen video

[@Ricky911_]

" I thought cold water was supposed to boil faster than hot water" "WHAAAAAAAT????"

[@renz1013]

@@Ricky911_ he was so confiused he forgot he was angry

[@Charles-iy2ec]

I searched for this video bc of that

[@braintwo3398]

*sanctuary garden plays*

[@HeliaBoi]

WHaT?

[@aetherblackbolt1301]

The original story even says "to ensure he had a spot, he put his ice cream in while hot" ie earlier than everyone else. So his hot ice cream had time to be cooled down by the freezer before everyone else could put their cooled down ice cream in. If that time was long enough to be cooled below room temperature, then it would have frozen faster.

[@repentoryouwilllikewiseper8741]

Repent to Jesus Christ “For the eyes of the Lord are on the righteous and his ears are attentive to their prayer, but the face of the Lord is against those who do evil.”” ‭‭1 Peter‬ ‭3:12‬ ‭NIV‬‬ Jj

[@noone-oi2po]

@@repentoryouwilllikewiseper8741 Ok

[@helixzenith]

@@repentoryouwilllikewiseper8741 Allah is asking me to ratio you. Blessed be His name!

[@barto22]

No. Some of his classmates already put their ice cream in the freezer and he was getting worried that his wouldn't cool down in time until the others would take up all the room, so he put his ice cream in while it was hot. So there was cool ice cream and hot ice cream at the same time in the freezer, and then the hot one freezed faster.

[@carltonbanks5470]

You must have missed teh rest of the video explaining all the scientific tests to control for all that. Including when Mpemba did his.

[@CaptainRon1913]

Funny, my wife and I tested this theory this winter (Northern Michigan). We had been talking about hot vs cold freezing for some time ago. We woke up one saturday to find it was -10F (-23C) outside and decided to put two equal glass 2cup measuring cups full of water outside, one hot, one cold. Filled both with tap water, the hottest it would go, and the other with the coldest it would go. Sat them both outside and watched through the window. The cold water cup froze what appeared to be a couple minutes faster. Nothing scientific, just personal observation. We figured doing the test outside, there would be less chance of being off by the freezer temp slightly rising from hot water, and having to pump to get the freezer temp back. Outside would remove that variable, and any variable of the cup sitting next to another frozen object. Both cups were in the shade, and about 3ft apart from each other.

[@Considerers]

But did you consider that maybe the warm cup was being heated from the presence of the cold cup (which was warmer than ambient temperature) in such close proximity, and thus caused the warm cup to freeze slower? Nah, jokes and science aside, it sounds like you two have a cool marriage. (Maybe because the marriage was hot at the start?)

[@tomhatherford3283]

@@Considerers was seriously about to blast you so hard hahahaha glad I read that whole comment. Like the way you tied it all together at the end

[@firebird2051]

@@Considerers I'm so glad that the effect really doesn't exist... For his marriage's sake...

[@Rick-the-Swift]

The problem with your experiment is you used thick glass to encapsulate both bodies of water, and therefor the temperature retention (thermal mass) of the glass continued to affect both bodies of water after they were placed outside. IOW the thermal mass of the hot glass kept the water inside from freezing as fast as it could have. You would have done better to put the two bodies of water in thin plastic bags for a more accurate result. And after what Will Smith did to Chris Rock the other night at the Oscars, I won't dare make any jokes which involves your significant other, but will just commend you both for being able to endure Northern Michigan winters together. ☺

[@mtklass]

One issue I can see here is that hot water went through some sort of heater, which introduce a lot of extra impurities to the water. This is why you don't use the hot water tap when cooking!

[@spoonmanvlogs5386]

But steel is heavier than feathers

[@-butterfly-594]

@Toughen Up, Fluffy *boot stayle es heayviea dan fehdhehs* kzbin.info/www/bejne/hGTFdptjhaqeZ8k

[@ollinnature9506]

But there both a kilogram

[@erenyalcn9393]

I really wanna look at the size of it Thats cheating

[@lemon5501]

Buh deyre boath a keilogriem

[@deluxeassortment]

Ah doon geh it

[@kenmendoza7580]

If vsause did this, this would be an hour long video that would include WW2 events.

[@haikalt.9279]

this guy!

[@PhilipReeder]

Haha! EXACTLY!

[@shashwattripathi2927]

I'd say only 30 minutes

[@kezzu5849]

So true

[@jacobshirley3457]

And I'd enjoy every minute.

[@purpl3grape]

This reminds me of something I've heard about Ice melting in salt water. Normally you'd expect it to melt faster with saline content. But because it dilutes the upper layers of the water, makes it less dense, so there's less mixing going on than there would be otherwise, had it melted in pure water. This thin upper layer of less dense water would gradually become cooler as the ice melts, which in turn makes it harder to melt more ice. It's a weird thermohaline balancing act. Without this, the artic ice probably would've been dramatically smaller now.

[@mann_idonotreadreplies]

Cool story bro.

[@link7417]

@@mann_idonotreadreplies i find it rather cool honestly

[@randymarsh362]

thats why icebergs float and thanks to that effect . If ice bergs didnt float on sea water we would be frozen solid

[@MadDogE134]

for those of us that actually churned ice cream by hand why do you suppose we salted the ice outside the churn? to keep the ice from melting so fast lol it also aided in making the ice that much colder to speed up the churning process. it was a big deal to have the family together on the weekends to congregate, eat and making ice cream was a family affair. i so miss those days

[@bledlbledlbledl]

The only instance of that I've personally seen was when my grandmother would splash water across the porch (because the duck pooped on it again). But that was a very large concrete porch, and the water spread way out, causing a huge amount of surface area per volume, so it's possible in that instance that most of the hot water could've evaporated, vs only a small percentage of the cold. (It definitely did make a big cloud of steam)

[@kathrynck]

If it's really cold out (like Canada cold), you can throw a bucket of water into the air (as hard as you can) and make it rain snow & sleet.

[@webby2275]

@@kathrynck when you throw the hot water I to the very cold air, it evaporates very quickly into steam, but because the air is too cold to hold that vapor, it almost immediately condenses back into tiny droplets, which are smaller than the original hot water droplets, and therefore freeze faster. It's such a cool effect and requires the air temperature to be below a certain threshold to work.

[@youtubeuser206]

@@webby2275 Jew magic, I say

[@broncosbreaks]

My mom would do that to the porch too, except it was when I pooped the porch

[@user-by6tn2ud4s]

@@kathrynck ee1

[@Shane24597]

This man really made me question my intelligence for 6 minutes before he threw in "but oh yeah, this effect doesn't exist"

[@duvisol]

Under controlled situations. However, some other elements make hot water freeze faster, not like cold water. But yeah, it looks like it's not about the water being hot but the environment provoking effects.

[@mat5473]

@@duvisol So basically, every time someone witnessed hot water freezing faster in the past, it was just a coincidence due to environmental variables?

[@outogetyougotyou5250]

@@mat5473 Yes.

[@user-svqmbiv]

@@mat5473 which could still be useful information to know. I mean knowing how to make things freeze faster would likely be applicable in multiple settings. But it's not an innate property of water.

[@343JustMe]

Yea that's what I was expecting actually, I was really contemplating and thinking how this just doesn't make any sense

[@swedneck]

Vsauce without going off topic 10 seconds into the video, i love it.

[@Psyberify]

Tim Stahel LOL right?

[@baassie123]

Dude, you made me laugh so much. It's almost too true. :')

[@aston8040]

Tim Stahel I am the 793 subscriber!

[@nicolevs8712]

it's veritasium/sciencium... not Vsauce

[@XavierXonora]

I love that about Vsauce. Both channels are great

[@danqodusk8140]

Excellent presentation. I've pondered this process for several years.

[@rong1924]

“You can’t dismiss the Mpemba effect out of hand” Watch me.

[@aureusknighstar2195]

"Why are you boiling cold water?" "Because I thought it boils faster, Chef" *"...What?"*

[@Pr3Va1L]

There is a good reason to boil cold water, though. Bacteria that live in cold water will die in hot water so you end up with "cleaner" water.

[@nikemegu1142]

If i remember correctly, gordon ramsay was confused because the girl ADDED cold water to already boilling water to boil faster

[@ewoudjoy]

@MineSweeper IIRC, it has more to do with the fact that if you take water from your tap, hot water could be more contaminated with unwanted components stemming from the boiler system or heaters. Impact is not significant of course, but generally people take normal water.

[@japzone]

@@ewoudjoy True. I never drink hot water from the tap because it tastes awful.

[@darkdefender9919]

She a lil confused

[@videogyar2]

So... is that a no? Or a maybe? Or sometimes?

[@kylewilliamrobertson5121]

Yeah I'm confused

[@iancd9171]

It's a no, because of thermodynamics.

[@cezarcatalin1406]

test it with your freezer, get 2 dishes with pre-boiled distilled water, make one hotter, add equal amounts of pointy things to them (just add a wet wooden toothpick in each one of them) so no supercooling happens, insulate the bottom of the containers, cover them so no evaporation happens, the water is in dishes so not much convection there, and the water is distilled and boiled so no much gases and salts in there, put them into the freezer and watch what happens from 15 to 15 minutes

[@cezarcatalin1406]

Check and write down when and which start freezing first then when and which turned 100% solid first

[@Wafflical]

Sometimes. But if everything is properly controlled, no.

[@davep.7099]

It would be interesting to do the same test with small suspended particulates (diatomacious earth would be a good medium, would not effect the chemistry of the water but provide lots of sharp angles for crystallization to begin). Could be the early heating process left more particulates suspended than the water that was left to cool.

[@kimgkomg]

You do that

[@kyriansalvar247]

You could probably spend less fine looking at previous experiments and the conditions. In labs, water is all coming from the same source. It's likely they just heated one sample with a hot plate

[@butterflyjaie9550]

I really tried to follow what you were saying. Thanks for the video

[@MFaiz-zm2qp]

But does cold water boil faster ?

[@andrewmartin1829]

Oh no I've been bamboozled again

[@seemeslegit3765]

No

[@lonewanderer1017]

You forgot the Lamb sauce!

[@KickingItWithCamson]

Actually yes, fr

[@EldeNova]

*FACT:* If you mix hot water with hot ice you get boiled ice and it's the source of all energy.

[@valennoronha6601]

If you feel one day that you have discovered something new and unusual, mind it guys... there is always a Greek homie who found it centuries ago. XD

[@OtakuNoShitpost]

But from this we learn that you can still get it named after yourself

[@NiqIce]

草

[@marios1861]

@2 Nep8id6 surely you jest

[@nevermindthebull0cks]

@@marios1861 Hey, don't be calling them Shirley.

[@jsmith5443]

There is a verse in the Bible that says there is nothing new under the sun.

[@donovanmahan2901]

He neglected the fact that putting the hot mixture in the freezer cooled it to room temperature faster than his classmates' mixtures, which were left out to cool to room temperature, per Newton's Law of Cooling. It then had time to cool from there towards freezing while his classmates were still waiting for their mixtures to cool enough to put in the freezer per the directions.

[@tombudd1281]

You blew my mind and had me questioning everything for the first part of the video! I even started to reconsider all those times the kids told me the dog ate their homework or that "nobody" ate the cookies!

[@Incognito-co6og]

"What? " - Gordon Ramsay

[@martinbudinsky8912]

I dont get this... It wasnt Gordon who claimed cold water boils faster but one of the contestants...

[@Incognito-co6og]

@@martinbudinsky8912 Gordon ramsay said 'what?' after the terrible logic the contestant gave him.

[@martinbudinsky8912]

@@Incognito-co6og Exaclty so why would you coment that instead of quoting what the contestant said? This way it looks to someone who doesnt know that Gordon said something stupid.

[@anazero1592]

@@martinbudinsky8912 bruh

[@anazero1592]

@@martinbudinsky8912 read the video title then read this comment again

[@xenaguy01]

I learned that the Mpemba Effect both does, and does not, exist.

[@kajxqeirscl]

Schrödinger's effect I guess

[@xenaguy01]

@@kajxqeirscl That's both true and false. I guess. 🤷

[@DamienDarksideBlog]

It does exist in real life, since again all the impurities and everything he mentioned would be a part of it. However in a controlled, test environment it doesn't show off? I honestly don't get the conclusion of the video. IRL it clearly works but in lab no?

[@xenaguy01]

@@DamienDarksideBlog _"I honestly don't get the conclusion of the video. IRL it clearly works but in lab no?"_ Which, I believe, is pretty much exactly what I said, right?

[@jackfoxx6351]

@@xenaguy01 yup same here

[@Weltbummler23]

Great job 👏

[@An0nymous_L0gic]

i was eagerly anticipating how the auto CC would interpret Mpemba. dunno if the same word was ever repeated. enthralling

[@EEVblog]

OMG don't mention water "memory"! The homeopathy quacks will have a field day.

[@theresaquinn8525]

EEVblog like Nobel laureate luc montigers experiment

[@user255]

+Theresa Quinn His claimed result have not been independently replicated. Thus they are widely considered pseudoscience.

[@dbanetinc]

EEVblog wow Dave watches Veritasium! Gday Dave.

[@Ramiromasters]

Funny you should say that because as black-hole research tells us everything has information coded in it; for it to disappear thermodynamics would have to be wrong. Then we have the facts that super cooling and crystallization is not well understood, as pointed out in here, so is clearly not easy to tell what resonant waves are doing in water. It is a stretch to claim they don't do something as it is to claim they do, however, the crystallization mystery points at that in some circumstances they do...

[@user255]

+Ramiel You are confusing what black hole information paradox really means. Example take a hard disk and melt it into pool of metal. Now it really has forgot what was written on it. Thermodynamics does not say water have to have memory. In fact, if water would have memory (despite of the fact that it cannot be demonstrated), it would go against homeopathy. Because then water would have memory of absolutely everything it touches, which would make example tap water homeopathic product for and against millions of things. Also super cooling and crystallization are quite well understood, and more over nothing to do with memory of water. Not even water.

[@cgaccount3669]

It's real. Here are 5 explanations. So in conclusion... it isn't a real effect and doesn't happen

[@DiabloDBS]

5 possible explanations a.k.a. hypothesis or as stated here proposed mechanisms. While you could argue why even go indepth with these and not just dismiss them and explain why.. it would probably not make much for a video and people usually like to get something explained before you tell them that it isn't really useful .. no .. wait.. maybe not.. :-P

[@MrScooter46290]

CG Account Thanks for that comment. This video hurt my brain.

[@nickmagrick7702]

yeah kinda poor explanation isnt it.

[@arc3celestion]

@CG Account He didn't say it was real. He said, "According to the Mpemba effect..." which is accurate. In other words, it's like an optical illusion -- real in a sense, but not real in another sense. I didn't feel misled at all. The storytelling needed that mystery to draw the viewer in and I thought the explanation at the end was satisfying, though his, "Here's what I think..." was egocentric, as if he came up with the solution on his own, which he's done more than once. Scientists, not him, did the hard work and found that the Mpemba effect is not replicable every time and that anomalies cause it. But I appreciate his bringing us these fascinating science factoids/facts/findings.

[@lancewedor5306]

He clearly states that there is no Mpemba effect; one learns this close to the end of the video at approx 06:40. Seems clear to me: he presents the idea, explores 5 possibilities for its explanation, finds them inadequate, draws his conclusion. Others' confusion confuses me!

[@mikeagne5933]

The convection part makes a lot of sense, and so does the melting/frostlayer I could see those two combining to make it likely to happen in a few scenarios

[@hirni4ever]

Maybe it's something like with protein folding, where the energy landscape of the ice crystal lattice looks like an energy funnel, but with smaller valleys on its sides. For protein folding, researchers add small amounts of energy to the system to get it out of local minima deeper into the funnel. Here, it could be similar

[@vesteel]

VERITASIUM WANNABE

[@adityakhanna113]

hah!

[@warpedreality7988]

vesteel Fuck off, he made this channel, it's in his new video.

[@ErikN99]

Tim van de Goor HAHAHAHAH

[@adityakhanna113]

+Tim van de Goor Jokes

[@Vession]

He even copied the hair.

[@starwarslore4299]

This may be a stupid question but how does water ruin electronics?

[@sciencium]

by creating conducting pathways for current to flow (where it's not meant to), which can create short circuits and fry electrical components.

[@bignate2814]

Star Wars Lore I'm pretty sure it shorts the part of the circuit by connecting things that aren't supposed to be connected. Due to the high conductivity of water

[@starwarslore4299]

Sciencium ah that makes sense, thanks!

[@starwarslore4299]

bignate2814 thank you!

[@adityakhanna113]

Funnily enough, water doesn't. The ions in it do.

[@rhett786]

my monke brain ''FREEZING IS FREEZING, NOBODY CARES HOW LONG IT TAKES THO''

[@mythicaltwinkie8216]

I love how a simple yes or no question is drawn out into a 7 minute video

[@scofah]

I love love love that your video isn't full of unnecessary sound effects and music. Honestly I'm so sick of the audio hype on the other channels. Thank you for just sharing without all that background noise.

[@elchegos]

I think that's because he and his video content is entertaining by itself and doesn't need to add distractions to his videos.

[@bkailua1224]

I have to agree, nothing worse than silly background noise so common on this venue.

[@godlyvex5543]

@@elchegos Yeah, video games that have music are just compensating for bad gameplay. A great video game doesn't need music.

[@halalbach1855]

I especially hate when the stupid background noise and music is 10 times the volume of the speaker

[@flap.d.jack247]

This is the opposite of: „I thought cold water boils faster than hot water“

[@Jay-nj1oz]

A man of culture

[@zoowing2635]

I was surprised that youtube recommended me this video under the other (meme) video after I read a comment arguing about this exact same problem.

[@MrChillyZ]

WHATTT **confused gorden ramsey face**

[@Not_Claptrap]

I actually believed this was true for years

[@flap.d.jack247]

@@Not_Claptrap *confused Gordon Ramsay face*

[@charltoncarswell9977]

Awesome. My wife and I have been arguing about this for 29 Yrs. Thanks for supporting me and my hypothesis!

[@desertodavid]

Charlton, you're trying to tell us that you argued with your wife for 20 years, but you've never actually done an experiment to see whether your hypothesis is a fact or not?

[@THEL05]

Excellent ! 👌🏻

[@n484l3iehugtil]

Can we see an infrared recording of hot water vs cold water being cooled? Then we don't have to keep measuring the temperature of water at specific points with a thermocouple and making measurement errors like this.

[@fdggfgdfgd251]

Yea.. but .. IR camera has to be calibrated... and the emissivity and reflection of water .. the surface etc.. make this way more inaccurate . I dont even think if u did tbe two as a side by side comparison u could justify it

[@hunterwilhelm]

The infrared camera uses electricity to operate the sensor, which means that the camera sensor has electricity running through it to capture the image. Electricity always generates heat in electronics so that would affect the experiment if the camera was within viewing of the controlled experiment.

[@88Timur88Bahmudov88]

@@hunterwilhelm it's ridiculous, because if the camera heating could affect freezing of water, then your PC would be able to burn your house just by heating up

[@martinbudinsky8912]

@@hunterwilhelm Easily avoidable by placing the camera in front of a freezer with seethrough door. The problem is elsewhere and someone already mentioned it here. The reflectivity of water etc...

[@KnochenGott]

@@martinbudinsky8912 wait i thought thermal vision doesnt see through glass?

[@goldwinger5434]

In 1971, 7th grade science class, we tested this hypothesis as a homework project. In our home freezers, each of us put six Dixie cups of cold water and six of hot water with regular checks of the state of the water. Roughly 30 kids in the class, with 12 cups each, that's 360 samples. As I recall, one kid claimed that he had one hot cup freeze before the cold ones. We all assumed that he was lying because he wanted the attention.

[@1414yorks]

Congratulations you have been patiently waiting 50 years for an opportunity to tell that story🤣

[@goldwinger5434]

@@1414yorks I've recounted that story many times over the intervening years.

[@vuedanto8576]

Most of the times the right is made fun of by the wrongs

[@nathanroberson]

It’s a trick question. Hot water can’t freeze at all.

[@Sotanaht01]

​@Nathan Roberson Sure it can! You just need around 10,000 to 100,000 atmospheres of pressure.

[@scottmactavish9716]

I'm super glad I watched the whole episode!

[@christopherjohnjones-parke5026]

You just blew my old ideas out of the tepid water. Damn son.

[@hensontm]

'did you top it off with cold water' 'Yes chef' 'why' 'i thought cold water would boiled faster than hot water' 'whaaaaat?'

[@hjalmarnilsson1756]

Then the water is not cold

[@briea3438]

He added cold water to the hot water in the pot.....he made it warm vs the boiling it was at already. It's like throwing ice in ur hot tea, then being confused that it doesn't stay hot.

[@plur5ever]

“I thought cold water was supposed to boil faster!” “What?”

[@theloafdude8304]

* visible confusion *

[@vladtheimpala5532]

Cold water never boils. It has to get hot before it will boil. To prove this for yourself, put some water in the refrigerator and some water in a kettle on the stovetop and turn it on (don’t forget to turn it on). The water on the stovetop will boil if you turn the heat up high enough. The water in the refrigerator will not boil unless there’s something wrong with your refrigerator. Water boils at 100 degrees Celsius or 212 degrees Fahrenheit at sea level. That’s hot, not cold. I have just used many words to say something that could have been said in one short sentence. I could have used bigger fancier words and it would have been just as dumb. Now I’ll explain why hot water never freezes. Blah blah blah. Blah blah blah blah blah blah. Water freezes at zero degrees Celsius or 32 degrees Fahrenheit at sea level. That is cold, not hot. In conclusion, cold water doesn’t boil. Hot water doesn’t freeze. This is known as the VTI (Vlad The Impala) effect. 🤪 Of course Aristotle knew it 2,300 years ago. 🤨

[@plur5ever]

@@vladtheimpala5532 You do know that I quoted a Hell’s Kitchen episode, right?

[@vladtheimpala5532]

@@plur5ever Actually I didn’t know that. I hadn’t heard of that channel. I did see the quotation marks though and I did see the “what?” I figured you were quoting something I didn’t think that you seriously thought cold water would boil. I just figured you were goofing around and I was goofing around too. I didn’t mean anything by it. Peace - Jeff

[@ossiebalboa5617]

In older freezers, the shelves themselves were made with the freezing cold evaporator tubes which always iced up. The hotter container melted this ice , which refroze and made very good contact with the container, allowing greater transfer of heat away from the container into the evaporator tubes. The less hot container did not melt the ice and had poor heat transfer.

[@Ellipsis115]

I find it interesting that a few of these are following by (paraphrasing) "this was controlled for and the effect still occured" I wonder if collectively they might cause it and if that when controlling for *all* factors it dissapearing would make sense.

[@AwesomeCrackDealer]

Wtf how did Aristotle freeze his water?

[@ataozcan23]

he put in freezer duh...

[@arthurmee]

There are snow covered mountains in Geece. Check it.

[@bobhart7067]

Maybe it was salt and ice. Salt water freezes at a lower temperature then fresh water. Such as making ice cream.

[@consciousanimusic9293]

he was a cool dude.

[@oberfor7154]

@@bobhart7067 WTF dude

[@nic12344]

What about throwing a bucket of water into the air at -40? When the water is boiling, it condenses to snow before reaching the ground, but when it is cold, most of it hit the ground.

[@Kratax]

Exactly, I thought the same.

[@mariajohnson1744]

It's not "snow", it's steam. Repeat the experiment and let me know if you can get a snowflake .

[@bluedemon9985]

Nicholas R.M. when the water is thrown it turns into a mist due to its temperature. As a mist, the water will have a larger surface area and will cool much more quicly.

[@blizzrd2393]

Yeah, like 'DicksOut' said, I think that has more to do with the fact that the individual steam particles will freeze faster than the water in a more tightly packed liquid state.

[@DavidAllen_0]

A bucket is a terrible idea. Use a cup, you'll achieve finer results. Also, wear gloves. Don't think that the water will freeze instantaneously because if it's hot enough, it can burn and scar your skin.

[@salehalsekhan697]

Great video ! Is it possible to discuss scattered (or showered) boiling water and why it freezes faster ? This would allow the research to go beyond the container and would possibly make it perfectly not related to convection nor volume

[@honestly7134]

Known about this topic for 35 years and your presentation is great. Made me ask the question about the consistancy of "energy density??" through out the ice. Wonder if the experiment was continued and the beakers were placed in a 70 Deg F room, would they have different thaw rates. Also how does thermal conduction vary with the density of the ICE? Is the ice density different depending on the rate of freezing? The ice cream observation is easily explained by the cooling of each sample during the wait time between the first and last samples to be put in the freezer. If the difference in wait time was 30 minutes, the sample in the freezer for the additional 30 minutes would obviously be at a lower temperature than the one that sat a room temperature during this wait period.

[@bleyz3557]

So we had to listen what is Mpemba effect and how it works and finally we actually gets that Mpemba isn't a real thing.

[@bobbygushlinger3637]

Bamboozled

[@DamienDarksideBlog]

Not in a lab. Also they removed the "freezing" and just went with "Get to 0 degrees" which is not what we were looking for, but cool. It works, and science can control it in labs if they try really hard. The video did an absolute piss poor job at the last third.

[@kaleb982010]

@@DamienDarksideBlog 0 is freezing my man.

[@asphorcata]

@@kaleb982010 nah man, i think 0 is like the "grey area" where there is still some liquid and some freezing. solid freeze start at -10. but yeah this is my real life condition, not the controlled environment so maybe there is some explanation needed

[@_RiseAgainst]

@@asphorcata pure water a 0° and 1 atmospheric pressure will freeze eventually. The hot vs cold was simply measuring which freezes quicker. The video does a bad job of differentiating between first to zero and first to freeze experiments.

[@scilabus]

Hello Derek, May I ask why a second channel? I would think that this content would fit on your main channel. So I'm curious what drove you to make a new one. As always, I love your content ;) (my very first video was also about the mpemba effect. But it was my very first video in my life. It was bad! Thanks for this insight about this phenomenon, that's very interesting).

[@scilabus]

I don't think Derek does this kind of thing without reason. So I'm curious to know what it is. I'm gonna read the comments now (since you added an Edit, I guess there's something interesting)

[@lavajury44]

It may have something to do with him joining Bill Nye on his new show about science? idk

[@danhenricus]

Scilabus Scilabus Well, he's using another format here. With Veritasium he mostly goes to places, his second channel is a behind the scenes and an 'impromptu' video channel. This seems to follow SciShow and the like format; just one person in front of a blue screen. I'm curious to see if he manages to find interesting topics that haven't been covered by all those channels.

[@gabybesombes84]

I guess that it may be a more "scientific" chanel where he goes in less details and expects his folowers to have a litle bit more knowlege than on the others. At list it's what it looks like to me. I mean, wouldn't he explain what supercooling is on his other channel? And if that's what it is i'm in, even if I may not understand some topics, I'll just have to search on my own for the litle details I do not understand ^^

[@penguinexpress12]

This is actually his third channel, he has 2veritasiun

[@solomontong7145]

Yoooo I didn’t even realize this is the second channel. This channel is doing so well so far

[@TheGreatWolfYT]

Did an experiment in the winter on this. We filled 2 glasses with tap water, one as hot as possible and one as cold as possible, and threw the water out the window from the first floor. The water from the hot glass turned to powder (snow) by the time it reached ground, not disturbing the snow below. The water from the cold glass didn't change at all and splashed the snow.

[@N1ghtR1der666]

the extra steam from the heated water may be breaking the water droplets into smaller parts which then freeze faster

[@shimassi9961]

1:44 don't like the sound of those clicking noises. they make me feel uncomfortable for some reason

[@ShahidKhan-eq1gx]

Shimassi do you have misophonia?

[@RubixB0y]

ai, es no bueno

[@jorandebraekeleer7557]

+Shimassi Same here

[@ShahidKhan-eq1gx]

what's your good name? Because I have some form of this condition myself. I don't like munching sounds

[@piperman69]

me too man, i would like to know why is that

[@independentomega2701]

I learned from this video, that in real life the effect exists. But if some scientists in a lab want to try really hard, they can remove it.

[@23Khameo]

What we have to take away from this is that scientists couldn’t come up with an answer as to why this happens. Also this contradicts our current knowledge of thermodynamics and finally that it was easier to find a way to negate the effect. So all in all they found it easier to say fuck it and claim that is not a real phenomenon. Way to go science! 😂

[@mauer1]

Well they basically proofed that it doesnt matter how warm or cold water is for the time it needs to freeze. r at least, it doesn't matter as much as litterly everything around it. So you may or may not be faster with freezing hot water, but you definitly know you would have been if you tried it with cold water in that exact same circumstance. which is funny because people knowing this would still take the chance of beeing faster with warmer water for whatever reason.

[@wingedfish1175]

@@mauer1 beacsue its better to take a chance on something taht people believe exists then to just ignore it and achieve the same result anyway

[@mauer1]

@@wingedfish1175 well thats the thing though, it is indeed faster to freeze cold water. To make the decision to use warm water is just nonsense. because it definitly is worse than cold water. It just might not matter if you wanna race against someone with it.

[@prefrontalcortex2602]

Well it seems to me to be result of an out side source much less than heat plus water cools faster its possibly a combination of multiple easy to reach scenarios to attribute this effect. Instead one explicit answer futher study may yield that for example just spit balling that going to a high/varying pressure; source heated water to a low pressure source a fridge may yield results. Or bubbles increasing top surface increase surface area may freeze faster. Or even better yet what the last study cited that in the direct center doesnt actually change faster just it is perceived since the out side solidify faster. But when you average out the heat then disproves it. Other wise super cooling may actually be the key to the answer. Im no expert by any means but brushing it off weither its true or not isn't going yield a explanation what actually happened

[@2gyi718]

Observed by many great thinkers and innovators of history but this schoolboy gets the naming haha. Good one Mpemba.

[@khall3353]

Well my guess is that with hot water the molecules are moving around more frequently with greater intensity than that of cold water. Whilst the cold water is more calm and still. So I guess that with more moving molecules the water has more overall chance of finding a site to crystallize at. With water that already cold and thus more still would have less chances to find a site for crystallizing.

[@xrete]

so stirred water freeze faster?

[@lavrans00]

The channel was created back in 2013?

[@sciencium]

hahaha... it's been a long time coming!

[@warpedreality7988]

Sciencium Let's make the name of this channel the name of a new element!

[@oneetatsu]

i thought the mpemba effect was because the hot water than the cold water like ice is less dense than water so the freezing took place faster as the expansion was already done. like inflating a semi inflated balloon

[@marlonprofuss]

Tim van de Goor First of all we got to name element 142 Veritasium ; )

[@matj12]

What does 2.72 mean? edit while typing: I realised it's probably approximation of constant e.

[@azlhiacneg]

Ooo this is pretty cool.

[@sciencium]

I should have known you'd be first!

[@azlhiacneg]

Sciencium Well... I mean... I just finished some homework and was refreshing KZbin at the right time~ :D

[@kisileno]

azlhiacneg as cool as freezing warm water?

[@checkoutthatthing]

Pun city!

[@maintenanceman4800]

When i put two bottles of water in the freezer one in the back & one in the door 30 mins later the door bottle is frozen around the edges of the bottle and not ine the middle. but the other bottle in the back is thill all liquid. If i disturb, or tap the top it starts to turn into a icey like water. Really cool to watch. So placement in the freezing unit is key.

[@countrymiami]

Great explanation, but why no experiment?

[@Jim361tx]

Excited about the new channel

[@such1997]

Sounds like Schrödinger's Mpemba Effect to me!!

[@markiesparky]

Well I didn't expect that ending. And there I was thinking that the faster moving hot water molecules pull the freezing air around it quicker than the slow moving cold water ones.

[@programaths]

One should not forget that a similar effect called "hysteresis" do exists. As an example, if you have a spring on which you attach 2 weights of same mass one after another or attache the two mass at the same time, the spring extension will be *different*!

[@bryanong4879]

Answer: No but small tweaks like moving the thermocouple causes different rates of freezing which is cool. OK go and have a rest and save the 7min. Or just watch it anyways as it is kinda interesting.

[@frantisekfojt8688]

If someone us watching this it's in order to waste 7 minutes

[@cozmic8288]

gg

[@DrakeOola]

Moving the thermocouple aka a temperature sensor didnt cause the water to freeze at a different rate. They put it in the beaker to see if there were any convection currents present, basically just hot water and cold water mixing to "stir" the water in essence. We don't have any type of sensor to really measure water flow on such a tiny scale in existence although they could've just put a drop of dye. They mentioned the beakers were sealed in some tests and even a drop of dye could fudge the experiment so probably why they didnt try that. Also has to be introduced at the right time otherwise it'll just mix before the water finishes boiling...

[@icecreambone]

so... are there just enough variables that there's a big range of cooling speeds for both hot water and cold water that overlap and allow people to witness hot water freezing faster often enough to be psychologically relevant but not statistically significant

[@TheRABIDdude]

conti nue Exactly right! I wish he'd explained it as clearly as you have though!

[@simedinson984]

sounds about rigth

[@David-ud9ju]

Yeah. The studies were testing the Mpemba effect and they found it. Surprise surprise.

[@TheRABIDdude]

David um no that's not the point at all

[@markcundiff1697]

Apparently he never studied thermondynaics!

[@azorailke6057]

I was scrolling through KZbin, saw the thumbnail and title; my life taught me that it's a "No". I clicked on the video and the preamble stated that "Hot water does freeze faster than cold water", but I still stood my initial hypothesis. I watched to the end of the video and I was glad to know that my logic is sound.

[@coewhat]

Yes, I learned that just when I thought I learned something, in the end you said I didn’t. Thanks.

[@ferdyhoshigakitube]

how Aristotle freeze water?

[@ferdyhoshigakitube]

No Google, I don't want to use my real name. but how did he do the comparison ?. when he boil water in mountain, the regular water must be already frozen

[@ferdyhoshigakitube]

No Google, I don't want to use my real name. lol right

[@svampebob007]

the problem is that you basically start the timer for number 1 as soon as you take it off fire, so number 2 should freeze two minutes after number 1 since they both experienced the same source of heat. if number 2 freezes before number 1, then you might need to question the experiment, because wtf changed? air speed? temperature? how does H2O at 100c cools down faster then H2O at 100c that has been out for 2 minutes? would number 1 freeze faster if you heated it back up again to 95C while number 2 was nearing 90c? Aristotle was a very clever man, but his methods were bound to be slightly wrong, physics says Energy in = Energy out.. unless you add or subtract energy. the idea of hot water freezing faster then cold water invites the idea of a perpetual motion machine.

[@johnjon4688]

except that it actually doesn't on a consistent and repeatable basis. did you watch the video to the end?

[@MartinVaupell]

Well he used his Freezer of course, power by nuclear power. Or as some "homeopaths" call it, nature.

[@starwarslore4299]

I'm looking forward to the content on this channel

[@ongeri]

Some kind of thermodynamic inertia was my first suspect. Some kind of leftover motion from the previously hot molecules that improves the exchange of heat.

[@drewweber8260]

The Mpemba effect can only be observed in the right circumstances. At its core, surface area is the main component allowing this effect to take place. Due to a processed called convection, as hot water is chilled, the warm water in the center of the beaker rises to the top of the beaker creating physical movement. The longer this process goes the more it speeds up at a comparably exponential rate. This causes more and more surface area, of the water, to be exposed. However, many other factors can prevent this exponential-flow-process, such as obstructions or even how the beaker is made. Cold water is slow to start this process of convection due, in part, by the fact the water molecules in the cold water are less disrupted by the cold temperatures. This is only my understanding. Edit: I also wanted to add. The best way to cool a constantly heated item is by passing hydrogen molecules over its surface area. Factors such as how cold the hydrogen particles are make little difference in cooling the item. The main component is the passing over of the hydrogen Molecules. So in relation the the mpemba effect; As more and more convection takes place, more and more water is exposed to hydrogen molecules.

[@tabaks]

No, I did not learn anything from this video except that anything can be fruitlessly argued for a desperately long time.

[@adamxue6096]

I learned something from it, the 5 ways of explaining it was actually pretty cool, I knew before that the more heat an object has it loses that heat energy faster(That been like comparing 2000 down to 1000 and 1000 down to 0, the speed of two material cooling down the same amount of Celsius but one with higher temperature will cool faster), but the hot water thing is something I know but don't understand exactly how and why it works like that, simply because u can't possibly under the same condition having a thing that has more heat energy than another one, and have them both cool down to a certain amount of heat energy. So this video did help, it is also good to know. Btw, Scientists are pretty BS at times like this, because you simply can't prove it, therefore the conclusion is it doesn't exist... Yet... When you can it is true, no matter how stupid it seems. Also any effect might one day come in handy, and when you think about this, if people can spend years talking about toilet paper orientation, and where to start eating a banana, I don't see a problem with people trying to explain and uncover the truth behind a thousand years old question that is very interesting and hard.

[@iwantitpaintedblack]

I always thought hot things cool down faster because of the large temperature difference , so if Delta temp is large, cooling will be faster

[@brandonrodriguez3027]

I did hot water freezes faster beause of the particals

[@jacoblandry9377]

i know its like stfu and cut to the chase i could of explained the mpemba effect in like 10 seconds

[@David-ud9ju]

@@nateman10 You're full of shit. Your clearly have no idea what you're talking about. Scientists don't fucking make stuff up to make it easier for themselves you dumb prick. All this so called documentation was actually wrong and it's actually an extremely complicated thing to describe. You clearly are completely ignorant of science and how science works, so why are you here?

[@emsity819]

Me searching i thought cold water was supposed to boil faster on youtube: ok easy Me after 3 hours:where the fuck it is

[@weckar]

I believe it's a matter of Thermal inertia. The speed of energy loss is accelerative to a point, or at least continuous.

[@shadowkomet7180]

pressure, and the distance at which water forms crystals. Hot equals low pressure, distance increases to crystallization which reduces or stops particle vibration, that vibration that gives us part of the sensation of heat. Water Crystals also deflect or insulate infrared, the other part that gives us the sensation of heat. this is just a hypothesis, but there you have it with what we already know about heat, water, and their various effects.

[@SH-lb1nu]

Imagine discovering something Aristotle discovered and getting credit for it lol? Like wtf

[@duvisol]

He just give a blunt observation. The other guys gave input, I don't think it's about credit but conclusion, each of the guys took the experiment under different circumstances.

[@evidad]

Look up Stigler's law of eponymy

[@Nexus9118]

That's because there was research data not just observation. Remember, the difference between messing around and science is writing it down (Quote by Myth Busters).

[@joemilton7552]

imagine the thing that they both discovered doesn't even exist at all

[@dr.robertjohnson6953]

Wife: "Did you finish making the ice cream?" me: "I sure did" Wife: "where is it?" me: "Well, because of the Mpemba effect triggered a secondary Mandela effect. It was there and now its not"

[@micheals1992]

You mentioned evaporation but only mentioned the reduced volume, evaporation has a pretty significant cooling effect. The energy to evaporate water is similar to the energy requirement to freeze water.

[@RoninJeremy]

but i have witnessed while in winnipeg at -55 deg C a pot of boiling water thrown into the air and the water froze before it landed. I thought it had to do with the increased surface area vs cold water froze on the ground, not in the air.

[@PierreMarkuse]

Interesting, but the sound effect for your logo shortly after 7:06 was a jump scare on headphones.

[@newtome-jessegates6310]

As soon as I heard about this I thought it might have something to do with the warm water having more energy to allow the molecules to getting into their crystalline form easier

[@balloonwind2863]

I did not see that twist coming...

[@hg60justice]

in peoples fridges maybe, where the higher heat makes the fridge run more and the coils stay cooler longer to remove the heat maybe, but like you said, it defies physics. i think people get confused in the throwing boiling water into extremely cold dry air and it dissipates instantly. cold water doesn't work because it doesn't have the energy to evaporate so quickly.

[@nates5703]

This is the answer. It's not an experiment about the characteristics of water. It's an experiment about the mechanics of refrigeration and thermostats.

[@Jaasau]

I've always been highly suspicious of when people tell me this. It has never made any logical sense to me, and your very first chart is precisely what my thinking on the issue has been. Thanks for this.

[@robymaru03]

Keep in mind he says it doesn't exist while stating that it exist and there's the fact there are some other variables that are unknown. Logically we just end up at the starting point without a real clear answer. One more thing, hot water make clear and durable ice while cold water does not.

[@justsk8n659]

@@robymaru03 actually, he states that under perfect conditions, the effect does not it exist, there are external forces that can cause a similar result however

[@tomhatherford3283]

@@robymaru03 that is a myth as well. The charity of ice has nothing to do with the temperature of water prior to freezing

[@SuperMontsta]

@@robymaru03 You can see very clear ice at Lake Baikal in Siberia, and that lake isn't heated. You can see plenty of videos and pictures on it, if you don't want to travel to Siberia to check for yourself.

[@thehesk1941]

Bruh I saw this in my recommended and read the channel name as "Sciencecum"

[@damienshirar8168]

Lmao

[@riftalope]

... And still you clicked on it? Brave.

[@damienshirar8168]

@@riftalope indeed

[@richardcollind2421]

I live in Alaska and there is a trick that you can do below -40 or so where you boil a pot of water and throw it in the air and it's frozen before it lands. It doesn't work with cold water though, always wondered why.

[@joeseabert8391]

When a kid we would ice a hill with warmed hill because we were told it would prevent bubbles so making the ice more solid and stronger for the metal skids to slide on.

[@mikeeiben3430]

I once filled 2 ice cube trays, one with cold water, the other with hot. Put them in a frost free freezer with the cold air blowing on both of them. The cold filled tray definitely had a crust of ice over it first. But if you throw a cup of boiling water into the air in sub zero weather, it will evaporate into a frozen cloud before it hits the ground. Cold water will still be a liquid when it hits the ground. The rapid movement of the molecules in boiling water causes them to separate in the air allowing them to freeze instantly.

[@TechDiveAVCLUB]

Matches convection arguments

[@themenace_omnyoji4141]

basically the same as if you were in a cold room with a group of people youd freeze faster than if you were all huddled up together

[@WholeCosmos]

Hot water vaporizes more easily at low pressure too it's why water boiling on Mt. Everest never gets hot enough to cook pasta. I bet the places that get sub zero are at high elevation and low atmospheric pressure in the demonstrations. The vapor gives off it's heat more rapidly because of the increased surface to volume ratio of water droplets. It's also why steam burns more badly in a short time than boiling water more heat transferred more rapidly its just the heat going the opposite way. heat of vaporization is why boiling water holds it's temp the extra heat escapes with the vapor. tossing it in the air speeds up the vaporization process and hence heat transfer. the cold water never vaporizes. If you could spray the cold water out of a warm nozzle (so the nozzle doesn't clog with ice ) to match the vapor particle size they would freeze at the same speed.

[@themonsterunderyourbed9408]

The whole "throwing hot water evaporates" thing is the same as your breath. In the cold, you can see the warm water vapor in your breath. If the air coming out of your lungs was the same temperature as the outside air, you wouldn't see your breath. The hot water doesn't "freeze" when thrown into cold air. It evaporates very fast (it would evaporate slower in warm air). When most of it evaporates, it might leave a few bits of liquid water which will instantly freeze depending on how low the temperature is outside. If you misted cold water into cold air, it would freeze just the same as the "mist" that's left after most of the hot water evaporates when you throw it in cold air. Hot water DOES NOT freeze faster that cold water. The freezing point of water is always different from collection to collection based on different mineral contents. The Mpemba effect has been observed to be both true and false in controlled experiments. Basically, if EVERY variable is identical, hot water WILL take longer to freeze because it has more energy to dissapate than cold water. But water is never "just water" and that's why sometimes hot water freezes faster than cold water and sometimes it doesn't.

[@WholeCosmos]

@@themonsterunderyourbed9408 it's very predictable by the triple point on a phase transition graph. It's basic chemistry and physics. Pressure and temperature are key to phase transitions. Also water has hydrogen bonding without which, based only on molecular mass water should be a gas at room temperature. But it is liquid due to the polarity or dipole moment of the water molecule leading to hydrogen bonds. Solutes or dissolved salt ions and other particles in water can effect the phase transitions by interfering with the hydrogen bonds by lowering the freezing point or boiling point at standard pressure for example. The Empemba effect is not a real effect... it's a misinterpretation of the phenomenon of supercooling of the water that was not heated first. Water that is both relatively pure and is in a very smooth sealed container, so there is no nucleation point for a crystal to form can cause this super cooled liquid water phenomenon. Usually the vessel is sealed so the pressure above the liquid drops adding a confounding variable. In Canning food a vacuum seal forms by this drop in temperature and therefore pressure inside the cooling jar relative to the outside when the gasses condense as they cool. The water can sometimes drop below the freezing temperature in this circumstance and remain liquid. It's like a beer from the freezer that instantly freezes when it is opened or disturbed. The alcohol and CO2 are interfering with the hydrogen bonds that also contribute to crystallization. Water when boiled maintains 212 degrees because the extra heat is given off by the phase transition to gas as the hydrogen bonds are broken at the surface tension. Break the hydrogen bonds and cause vaporization. smaller droplets of water have less surface tension as does water being heated. While it is heated the bonds get weaker and weaker until steam can escape. The temp at which this happens depends on the pressure and temperature of the atmosphere on top of the water surface. At zero or much lower pressures the water will boil at much lower temperatures than 212 F at a certain pressure or negative pressure relative to the atmospheric pressure well below 14.7 PSI or 760mm Hg water can boil at room temp. If you put a vacuum pump on a sealed jar of water you can get it to boil at room temperature.

[@ValentinNadolu]

I did not expect that twist at the end to be honest :)) I always thought about this effect at a molecular level by considering movement. The molecules in water move around more than the ones in cold water so there's a higher chance of them reaching the sides of the container and lose their kinetic energy by colliding with lower moving, lower temperature molecules. There's also a higher chance of hot water meeting cold water and loosing it's energy this way. It seemed to make sense to me since I usually stir my tea to make it cool faster. Or at least that's what I thought until now anyway.

[@Sonofsun.]

Bruh! You had me in the first half

[@bpulley1]

I wish my dad was alive to see this video. He would have liked it. He spent a lot of time as a subeditor of science textbooks and he argued against this being stated as fact in textbooks for years. Usually it would still be added as fact. It was like his nemesis lol.

[@NappyWayz]

Just start at 5:55 for the answer.

[@jennacook2505]

+

[@dirtyweapons3459]

Jesus thank you

[@kc-ip2vc]

He says that hot water cools faster in about the first minute

[@ducatimikep]

Thank you for that

[@Toutong_]

@@kc-ip2vc And in reality it does not.

[@piotrkakol1992]

I don't understand the reason for Mpemba effect not existing after all. Even if there was a study which showed that warm water doesn't freeze faster than cool water it doesn't rule out all these experiments which agreed that there's something like Mpemba effect. It just shows that Mpemba effect might need some additional conditions. The condition might be that cool water was poured to the container, then the other water was boiled and only then poured to another container. So the boiling water was moving more than the cool water and thus the states of waters were not the same. That's probably wrong but it's just an example of a condition for boiling water to freeze faster. The argument about measuring the temperature in different places also don't satisfy me because how improbable would it be for everyone to luckily measure both waters in such spots so that it appeared that the effect takes place. And lastly, I don't think it would break the laws of thermodynamics. It wouldn't mean that water has memory of its earlier states. It would only mean that we're only considering the temperature of the water and not other properties like directions of every molecule. So the water has no memory but contains more information than we assume.

[@MrBiky]

I am no professor in thermodynamics or physics in general, but don't some elements have better conductivity? Like for example copper vs aluminum. I know these are different elements, but let me get to my point. Probably different states of elements release heat faster than others. In this case it's room temperature water vs hot water, which have different energies, so wouldn't it be logical that the hot water releases its energy (heat) faster? When I was a kid, I used to put hot water and cold water in an unsealed ice tray in the freezer and always when I checked on them, the hot water was frozen solid, while the cold water was liquid in the middle and has a layer of ice on the outside. My theory might be wrong, but I want to learn / understand, so easy with the political correct answers / replies. Thanks !

[@eagames456]

Hot water does indeed release energy faster, but in doing so it reduces the temperature. At some point that temperature will be the same as the starting temperature of the cold water, thus it would cool at the same rate as the cold water. It would then follow the same curve as the initially cold water.

[@johnjon4688]

The result only states that hot water does not reach 0C faster than cold water. Not that hot water put in a freezer wont freeze faster than cold water. Due to so many things affecting the actual point of state change, there are literally a fractal's worth of possibilities. It is one of those tricky things that is a little more difficult to picture than it is to describe and is therefore more difficult to comprehend through non-mathematical (non-statistical) means. It doesn't help that water in general does not like to behave consistently on the molecular level. It is very prone to influences that are difficult to negate/control.

[@gluino]

This was what I wanted to say, but you put it clearer than I could. I would like to see someone *try* to (and succeed) determine what some of these "additional conditions" are that *will* produce the Mpemba effect that were reported in the past by experimenters that we assume were less careful in their procedures.

[@hunszaszist]

This is a great point. We often use approximations that almost match the things we see. Sometimes we forget that it is small things that contribute to the existence of all large things. It _could_ be some quantum scale change in the water that might contribute to this result. Though I rather like the convection hypothesis myself.

[@FreakyDudeEx]

so that means it has got to be the supercooling right because when introducing something else in the controlled experiment, the water starts to freezes faster sometimes... and evaporation effects helps to stabilize the timing to be more consistent....

[@nickkonkle541]

I like Descartes' explanation. All of the stubborn molecules get boiled off 😂