Neil deGrasse Tyson Explains Why Ice Floats

[@sugar1930]

Neil is an educator indeed. He's explained this amongst other concepts over and over again in several videos. Yet he still shows such enthusiasm!

[@alext7074]

But his explanation why we slip on ice is wrong... Unfortunately

[@pulkitmohta8964]

I know! I can't imagine being a teacher/educator and teaching the same stuff every year with a similar enthusiasm

[@alext7074]

@BS - 10GM 720145 Turner Fenton SS no, unfortunately not. Do you slip on ice with your shoes? The surface area of your soles is much bigger than skate blades... How much pressure do you exert under your soles? Not enough to liquify ice, but you slip on ice..

[@alext7074]

@BS - 10GM 720145 Turner Fenton SS I did research it, that's how I know. 🙄

[@TheHuggableEmpire]

@@alext7074 slip or skate..?

[@udornyc]

Here is an example of true, internalized knowledge: While explaining how ice functions on a lake 9:10 , Chuck mentions that's a bear's dream (fish being pushed to the surface from the bottom up), and Neil, without batting a lash responds that the bears hibernate and would miss this effect. LOVE IT!

[@ArtemLokhovitskiy]

I actually thought at first they are talking about Bear Grylls

[@WiseEmerald]

That also means ice skating wouldn’t be invented as fast

[@VideosOfEarth]

Neil is amazing because of stuff like this. True!

[@akoblake]

When he said this I wondered about Polar bears ...

[@fredricksonthe96th]

I suppose there wouldn't really be a need for them to hybernate anymore if this were true, huh?

[@Stick-a-fork-in-Gmorks-tort]

"F it!" - Ice cold H2O (Not a Rap artist but a compound)

[@Andrew90046zero]

Da ice says @@@@@@@@IT!

[@lalboimanlun1230]

Lil ice cube

[@vddr24]

The look on neils face when Chuck has to get a glass of water is priceless.

[@MeeMee-gz5vp]

Lol yes he reminded me of one of the Muppets

[@judethaddeus9856]

His face didn’t change

[@ProjectMorten]

@@judethaddeus9856 exactly

[@jeruakel]

I didn’t notice till you said it but im f***kin CRYING 😭😭😭💀💀💀

[@walterfolk4864]

@@judethaddeus9856lkm m

[@Ryan-ul2xc]

Every time Neil appears in an ad before a KZbin video I always watch it without clicking skip and find its usually more interesting than the video I clicked to watch and always find my way back here 😎

[@tanadarko6991]

chuck trying to think of the term upwelling (i'm going to guess) is delightful. Because I love that a COMEDIAN is so thoughtful and educated - a normal person who finds relevancy in science. Love this combo.

[@vargheseeralil8346]

Sometimes I’d see your video title and think “oh I already know why” and then I’d watch the video and somehow I’d still end up learning something that I didn’t know before. Love your content!

[@Eneov]

At the beginning chuck's "yes we are.." was straight out of invasion of the body snatchers

[@apeiceofgarbage9848]

Hahahahahahahaaaaaaaaahhhh it totally was

[@aaronseet2738]

My business philosophy: Freeze ten cups of water, sell eleven cups of ice. Profit.

[@charlesdick1133]

Outstanding

[@thomaslane1547]

Kona Ice business model works. ;)

[@LawnFlamingoPoop]

My business philosophy: Inject air into it as it's freezing to produce 12 cups, I undermine your business and we become lifelong arch enemies

[@rajatsingh2956]

Your profits will be consumed in the energy required to freeze it. Unless you are in northern Canada or something! 😛😛

[@aaronseet2738]

@@rajatsingh2956 my headquarters is at Antarctica!

[@adlerfg]

My first coffee cup in the morning, listening to these 2. Priceless. Thank you KZbin for existing!

[@AJD...]

Year 3030: Chuck has gained sentience through Neil's knowledge

[@linyenchin6773]

... sentience = having sensory experience... he already has sentience. Besides your faulty firm of respiration causing cognitive impairment; why do you mouth-breathers continue to misuse the word "sentient" where *sapient* belongs?

[@linyenchin6773]

No mouth-breather is human, they are merely intellectual.

[@VoltisArt]

@@linyenchin6773 worms and bees have senses. They are NOT sentient. Computer programs are not sentient. Sentience is having the cognitive awareness to emotionally feel and react, not just instinctively. Parrots, dogs, cows and whales are of low-level sentience. Sapient means being human or having human-like wisdom. At least look up the words if you're going to try to correct people over them. Not all "smart" people are better than the mouth-breathers, though some seem to think they are.

[@johndurland1966]

Pond hockey players everywhere are so thankful for this!!!

[@fidelecheverria6772]

But in fact that answer was wrong, the actual reason why skating happens is much more complicated and interesting. Dig a little you'll see.

[@loam]

Even though I knew why does an ice float (which is in the title of the video), I watched it because Neil always provides some more interesting information)

[@nikkokp]

chuck is on fire with the jokes today😂😂🔥🔥

[@Blaster00745]

Yeah to the point that he's even sweating 😅

[@LHSlash]

He makes these videos so much better

[@no6021]

No

[@akmalimdad6366]

No he aint hes been so much better

[@AlexHeisEngholm]

Water are you gonna do about it? And instead of he’s on fire it should be, his puns dripping and leaking out. 💧💦

[@JuanAMota-pu5zx]

Chuck looking for his glass of water. He looks so excited :D. Great video guys!

[@dariusechols751]

These explainers make life worth living

[@photelegy]

8:53 3°C water is the most dense? I always thought its 4°C, or is it different in the oceans because of the salt?

[@Quartan284]

Ever seen salt used to prevent something form freezing ? ;) Iirc 4°C is pure water. Tap water may have the 3°C Neil was taling about. And someone else in the comment said it was -2°C to -1°C in the ocean.

[@docButik]

yea. I thought also it was 4 C where water is most dense. Called it anomaly of the water in elementary school.

[@paulbrown7735]

I’m a long term fan of Neil but you guys are brilliant together. So glad I found your channel!

[@2l84t]

I remember as a kid one Winter finding the milk on the front step standing without it's bottle ...... Just carbon dated myself.

[@Cyberplayer5]

The ice cream man cometh....XD

[@constancemiller3753]

The bottle broke and left frozen milk? Cool.

[@pirobot668beta]

Another way the force of freezing water helps life; it breaks down mountains into dirt. Water in cracks freezes, fracturing the stone. More cracks and freezes, more gravel that tumbles down the river to become soil. Erosion would take so much longer if not for 'frost heave'.

[@tenoki]

Niel deGrasse Tyson: "Ice floats!" Hagrid: "You're a Wizard, Neil deGrasse Tyson!"

[@fyx812]

When I was young, am now 67, I remember my mom's refrigerator was the "OLD STYLE" with cooling tubes serpentining underneath the shelf (stay with me here) There wasn't a fan stirring the cold air around the freezer- just supercooled air laying on the shelf. Years ago, industry made aluminum ice trays, with pull handle partitions (also aluminum), I would fill the ice trays, and the water would begin to freeze slowly, quietly, from the Bottom/Outside, Inward...to the middle, as it did- the edges would be frozen, and the water would SLOWLY FREEZE to the Center--- and the Water would Start to Crest to a Peak to the middle, forming a miniature mountain in each section!! From That time on, I was Fascinated with Science!! Later I tried the Same experiment, with Plastic Icetrays in a Modern Refrigerator with the Cooling Fan blowing Air in the freezer Compartment--- Not the Same Results-- The " FAN" Disturbed the Air and "Flash Froze" the water in ice tray-- Resulting In a flat, cloudy ice cube. P.S. The water that was Frozen Slowly was Transparent. EXPERIMENT: Take a trip to a Ice Company that Freezes 300lb blocks of Ice-- Ask them to show you a Block- 80-90% is Most likely, Transparent!!! COOL...pun intended

[@ZeroOskul]

1:39 I've long seen Chuck as a dweeb but he actually pays attention and studies on his own. That joy at being on-topic--the prize to which is only in his own knowing that he is on-topic--is very close to nerd. Very close to nerd.

[@marcelihryniow211]

great vid. Thank you for educating. One more great example is when you hang a mesh with weights on top of an ice cube, in time the mesh will pass through the ice cube leaving it intact

[@Alexander-bd2hk]

how he holds back his smile :3 roughly at 2:52 priceless

[@rhmoreira]

I've watched so many videos in a roll that i completey forgot to leave a like. I think i was hypnotized.

[@nicklaskowalski]

Love NDT’s while Chuck is running to the freezer to get ice. His eyes are priceless in their expression 😂😂😂. NDT’s resting face deserves its own “not-impressed-slightly-bored-eyes-half-shut” emoji!!

[@IkeOzurumba]

This part was hilarious

[@nicklaskowalski]

@@IkeOzurumba yeah! @ 2:49 pretty much NDT’s resting face 😂

[@ricardoramirez2587]

new star talk intro, I like it

[@collincherubim2698]

8:16 Correction: There is a point where "water" is at its densest.

[@mhk5272]

And it's *4 degrees celsius not 3

[@256k_]

@@mhk5272 thank you.

[@fidelecheverria6772]

And skating has nothing to do with pressure heating the surface, that got disproved years ago. It's really complicated and super fun to know why.

[@JRose-dz1gf]

I've been listening to one of these discussions before bed every night, and I feel considerably more intelligent already. I can't wait to read his book as well.

[@ryanseward2760]

Whenever I get out of cold water now I'm not saying I've shrunk I'm saying I got more dense.

[@randydicotti3975]

I still have the very best topic for Neil to explain that EVERYONE will love to hear him explain. Just need to ask ;-)

[@mihaibuteanu8825]

You guys are amazing! Thank you very much!

[@jesseburley8349]

The most amazing thing about him I've noticed is that he is so patient he spends his life re explaining his knowalge over and over and gifting fellow humankind with what he probably considers common sense.

[@OkOk-tt2dg]

I love these videos, thank you gentlemen.

[@josephmiller1576]

Love this. . I love being educated and have the humble mindset to continue to learn. . .

[@PHutch-me5bq]

Love the info and that Scotch voice!

[@brandon893]

Love the new logo for star talk

[@TheFungusAmongus139]

Hey, what happen to that bumpin intro? I enjoyed listening to the bass at the end of the intro, what happen, man

[@ThinIceGroup]

It was getting old, tbh.

[@madeonearth6506]

The comma, clan.

[@Synster73]

Chuck's getting excited about ice spheres! As always, great information guys!

[@jaymontealegre143]

Niel: ...usually, when you cool something down it shrinks... Chuck: Tell me about it.

[@MarcoS-ue7og]

The bears hibernate, Neil thought of that in 1 second. Wow brilliant :) Love it

[@rykerhaskins1856]

This is an amazing video!!

[@spasticcreationist7999]

Yaay, another video to make me smarter😂🤙 youre awesome Neil💛😁

[@calumattidore7983]

@Michael disrespecting chuck like that smh

[@Ironage99]

These 2 are awesome. Funny and such a good combo. Keep it up chaps.

[@manalidesai4347]

its 4 degrees not 3 when anamollous behaviour is seen dear Neil

[@pulkitmohta8964]

I had the same concern

[@zlac]

@@pulkitmohta8964 Everything he says could be just as wrong! One more error like this and we'll unsubscribe, NEIL! :D

[@pulkitmohta8964]

@@zlac I won't unsubscribe because of few small errors made by a human being

[@lucass.4365]

Same 👍

[@Markle2k]

He’s also got the slippery ice thing wrong. The ice at rinks is too cold for the pressure to melt it. It is a combination of friction heating and lower Van der Waals forces at the surface. There is always a quasi-liquid layer on top because the ice molecules aren’t surrounded on all sides, so they aren’t as strongly bound to each other.

[@dsbaehler]

I used to come here for Neil. Now I come for Chuck.

[@mozkitolife5437]

When someone tells you lies, the power is given to them. When someone, like Neil, tells you objective facts with such enthusiasm, the power is given to everyone. Get excited about facts, people. It levels the playing field.

[@buzzsmith8146]

You guys are having way too much fun! Thanks.

[@Slam_24]

Mind blown... as usual

[@ukietheoverlord3159]

Neil & Chuck are the best!

[@RishabhTatiraju]

Missing the old intro :( But eventually Neil would be like, "Get over it!"

[@georgina50002]

It’s amazing all life on Earth depends on this property of water

[@Wolf_The_Dentist_Stansson]

2:10 That explains why the beer explodes in the freezer when you forget about it. Check Edit: 5:49 explains it. Check

[@stylis666]

And it's not wasted at that time apparently, because it's nicely preserved while frozen. You just have to drink it all in one go once it's melted again :p The more you know :p

[@valoriethechemist]

Yes, but due to the alcohol in the beer it will freeze slower than water alone... so... you should probably go check your freezer :)

[@ktkrelaxedscience]

Both simple and complex at the same time - and easier to understand than many other things. Love it. :)

[@fates6922]

"The water freezes on top, protecting the fish below!" You could call that ice insurance.

[@bouqueethius5104]

Yo I'm not there yet but me too

[@ezeenvrbz]

Icesurance

[@sortof3337]

New logo. I love it

[@james-faulkner]

Chuck, thank you for helping to keep this guy relevant. Your humour and insight contributes exponentially.

[@Dankquan]

great video

[@humanrightsadvocate]

*8:20** CORRECTION -* Water reaches a density peak at 3.98 °C (39.16 °F) - so, if you're going to round that number, it's more accurate to say 4 °C.

[@alext7074]

Also Neil's explanation why skates slip on ice is wrong.. Unfortunately

[@Swali_B]

Startalk - best whiskey drinking show ever

[@notarealperson87]

6:04 - after talking to so many other standups, Neil now sees how hard it is for Chuck to keep it clean

[@elvisgarcia3047]

Chuck always reads my mind. My man chuck becoming a scientist

[@coreysaylor4736]

Not exactly related, and maybe I'm dumb and everyone knows this already but... Why does freezing water make it expand? Doesn't heat make things expand? Molecules move faster and all that?

[@ajn465]

I know water is the exception to that rule and I was really expecting that to be the actual topic here

[@christianharriot1578]

When water freezes, the crystal structure of the ice takes up more room than the liquid. Thermal expansion is still a thing but it is confined to a current state of matter not the transition between states. An ice cube at freezing is larger than it will be below freezing.

[@coreysaylor4736]

@@christianharriot1578 Oh I see. Thanks!

[@MichaelDavis-uu9zh]

Thank you for doing what you do, the masses are more equipped and encouraged to think on their own and it’s a refreshing change!

[@Sei783]

I feel like Chuck's purpose is to play the wide-eyed unremarkable to Neil's brilliance.

[@AMPStorm]

"brIllIaNcE"

[@tedl7538]

He's like a Shakespearean jester.

[@99PTR99]

Every time Chuck gets excited in a video NDT's eardrums cry. The look on his face cracks me up every time!

[@KaliCush]

Thanks Chuck, now I want Scotch on the rocks!!

[@carultch]

Waiter: so, what'll it be, gentlemen? Guy 1: Scotch on the rocks Guy 2: Samuel Adams Guy 3: I'll have a Samuel...Jackson Guy 1: You know something, I'll have a Samuel Jackson too. Guy 2: Me three. Waiter: three Samuel Jacksons, coming right up.

[@tavogp]

I always learn something new in Star talk!!

[@elthomas_]

The pressure exerted by an ice skate is actually no where near enough to melt the ice. There are theories that either there is always a thin film of water on the ice, or that the surface molecules of ice behave like water.

[@wood4sheep]

Ice IS slippery.

[@wood4sheep]

www.nsf.gov/news/special_reports/water/popup/wg_icespeed.htm someone at NSF should fix that dead link.

[@alext7074]

Correct, I've left a couple of replies saying the same. Plus, we slip on ice wearing normal shoes. The pressure under the sole is a fraction of the one under skates.. Nowhere near enough to liquify ice.

[@vincevvn]

Yeah I thought that explanation didn’t make any sense.

[@bula9737]

Neil’s laugh will always make me smile and laugh along with him. May this man live forever ❤️

[@BlockBlazer]

Chuck needs to use his "scotch voice" and say "I'm Batman".

[@stylis666]

Hahahaha! This made me laugh way harder than it should!

[@Killerean]

I'll give you the short version of that: When water is liquid it's molecules are in chaotic high energy state at which the molecules can face each other in any direction and constantly shake. When water freezes it's molecules are in low energy state at which they take up positions in a crystal lattice. That prevents the molecules from aligning in space efficient manner and the volume they take up increases while the density falls down.

[@Seeds-Of-The-Wayside]

2:49 My face when my son tells me all about Pokemon

[@_CrisE]

Brilliant explanation... as always!

[@jameskerry41]

"In the Artic- the Artic where Santa Claus lives" ....lol too cute

[@pulkitmohta8964]

Arctic*

[@SteveBoobJobs]

@@pulkitmohta8964 lol

[@bradleypetschow]

Intro is awesome 🔥

[@thetramp123]

Ice floats because it's friends with water and water is like "I got you, bud" and holds ice up.

[@ANewHorizon]

You saved me 15 minutes, thank you.

[@Kha89478]

Makes sense

[@ejmtv3]

Love the new quiet intro.

[@therealdamancy]

should have talked about 17 different type of ice as well

[@pier-lucgaranddion1527]

Like the most treacherous and dangerous form of them all, black ice! ...oh. I'm sorry! o___o

[@gonderage]

that wouldve needed its own episode or two

[@kevinharnan8378]

Ice 9

[@OmniphonProductions]

If you fill the glass to its absolutely fullest level, using water and ice, you'll still need a coaster...because the condensation on the _outside_ of the glass will eventually drip down. More on topic, the properties of ice also explain why finding _ice_ on a foreign planet is exciting for biologists...because even if the surface is frozen, there may still be aquatic life beneath the surface.

[@acohyeah6572]

"Where Santa Claus live..." Santa Claus real confirmed

[@ahmedrafea8542]

Great show Neil, always entertaining and informative to watch you talk. Just a quick question. Did I hear you say that water is at most dense at 3 c? All my life I learned that it was at 4 C.

[@rcade1262]

Chuck's high again 👀

[@Allwayzworkin]

💯 😂

[@CesarRodriguez-ix1yd]

Neil looks high at 2:47 😂😂

[@rcade1262]

@Андрей Бахарковскй really?

[@rcade1262]

@@CesarRodriguez-ix1yd lol u are correct my friend

[@CC-gv6us]

For those interested, ice ball presses work by thermal conductivity. Copper is used for this reason. The heat from the copper can rapidly be conducted into the ice, melting it, until the press closes and leaves the sphere shaped void of ice. The press is not applying enough pressure to compress ice into water as this video suggests, but Neil would have known that had he been familiar with this device. It takes around 3,000 psi to do that.

[@stk1975]

when you cool something down it shrinks, tell me about it LOLOLOLOLOLOLOLOLOLOLOLOLOLOLOLOLOLOL

[@thelifeandtimesofjames4273]

Smashed it Chuck. That comment about being a home owner made me lol.

[@devinlauwerier404]

My phones dieing and i'm just like,"Bring it in Y'all!!"

[@foifoifoi610]

Dying *

[@Pragma020]

I don't often wish I had friends. But if I did, it would be Chuck and Neil as a pair.

[@simateix6262]

My scotch voice, Im dying lol

[@valoriethechemist]

Water expands in a solid date due to it's molecular shape and the configurations multiple molecules are forced to create thereof as the molecular movement slows and becomes a larger structure due to the polarity of the molecule. But it's always fun to see NDT put such stuff in terms we all understand :)

[@ramz3119]

what a Ice Video

[@philipberthiaume2314]

Anyone who lives in a northern climate like I do in canada, knows that snow and ice will protect your lawn underneath during the winter months. It not only protects from the harshness of the weather but also provides a temperature comfort zone. And you know this is true because the one winter where you do not have snow or ice, your lawn is very noticeably less healthy...

[@martino.9481]

Wasn't it 4° C when water was densest?

[@alext7074]

Yes, it's 3.9something, so very close to 4 if we round up.

[@stefandewet2414]

Best show ever gentlemen, I love your energy and discussions.

[@GhettoHuerta]

Ouuu that new intro doe!!

[@xain86k70]

I didn't know I needed to know more about water until now

[@ZeniferJenZ]

Neil and Chuck, nICE 🥃

[@Molybed1]

I learn something new every time I watch these videos, like 10% of ice floats above water.

[@juliaward2079]

Love it 😁 i would listen to you two talk just about anything Just makes me happy