Hot vs Cold Water Experiment (Chemistry)

In this experiment, you can visualize the difference in density between hot and cold water. Using the food coloring and a thermal infrared camera you can really see what is happening at the particulate level.
▶️ Get the materials to perform your own Hot vs. Cold Water experiment: www.beardedscienceguy.com//ho...
▶️ See Hot vs. Cold Experiment - Part 2 with oil and water here: • Hot vs Cold Experiment...
▶️ Hot vs. Cold Water Density Experiment Procedures:
Step 1: Gather supplies--two glasses of the same size, a hard piece of plastic, and two different colors of food coloring.
Step 2: Fill one glass with cold water to the brim, so the water is bubbling over the top of the glass.
Step 3: Fill the second glass with hot water to the brim as well.
Step 4: Stir in food coloring to the cold water. Mix well. I used blue for the cold water.
Step 5: Stir in a different food coloring to the hot water. Mix well. I used red for the hot water.
Step 6: Place the thin, flat plastic on top of the hot water glass so you can flip it upside down without spilling the water.
Step 7: Carefully turn the hot water glass upside down, holding the plastic in place, and set it directly on top of the cold water glass. Make sure the rims line up all the way around.
Step 8: Carefully remove the plastic from between the two glasses to allow the water to mix, and observe.
▶️ How the hot vs. cold water density experiment works:
You'll notice that the hot and cold water don't mix after the plastic piece is removed, with hot water staying on top and cold water staying on the bottom. That's because the density of the cold water has particles packed a little closer together than the hot water, and gravity is pulling them down now. it's time to repeat the experiment only this time we're going to reverse it so go ahead and fill up your cups with hot water and cold water again and then use the food coloring to make the hot water red and the cold water blue
Try reversing the experiment with the cold water on top instead, and you'll see the cold water and hot water start mixing quickly. This is because the higher density cold water starts falling down through the lower density hot water. The temperature of the hot water stays hot and the temperature of the cold water stays cold.
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[@wheresthepizza]

Crazy story but true. I’ve dreamed and pondered about this exact experiment for years but never actually looked it up to see if someone did it. I found this within 5 minutes of searching. What a great experiment! Thank you for the fantastic visuals and thermal views. Thank you for posting this.

[@anmolyadav3880]

sameee 😂😂

[@Tylerson]

MOAR! Great to see you back, my dood!

[@alethaprice3959]

Perfect... thanks for sharing! My students will enjoy doing it.

[@yeelingleong838]

This is excellent teaching material - clear, concise and well-structured. Thank you :)

[@milli3145]

Clear Words C:

[@jlpsinde]

Amazing!

[@chelseamckell]

super helpful, thanks!

[@Gabo012996]

Loving the content, BSG Keep em coming!

[@SarrouTube]

U are very good teacher !,

[@v4kira]

yes u makeing more videos now r the best

[@jaydenmikail23]

Yo

[@SarrouTube]

Very exciting experiment!,,,

[@shaibalsahoo2980]

very use full knowledge

[@bb-beast7978]

Jeez this is cool

[@arpitpandey7738]

Great

[@mntonic]

good explanation, keep rocking

[@milli3145]

'E'

[@ChillkittzGT]

Thanks for the experiment! my sibling have this experiment as their science project, and I stumble upon your video. Now me and my sib know the full procedure of the experiment and it ended up pretty well. thanks again!

[@keithlykabrutas3877]

thank you this video help me

[@lilsnipemike2426]

My school teacher is doing a test in this

[@iiiimaaaan]

Same With Me Too

[@iiiimaaaan]

Same Same Same

[@ryanemmanowell9703]

Same

[@milli3145]

Oop-

[@XxiBURNtomatoes1xX]

Same

[@VinitBavishi]

Why do you put only 1 drop of blue color and multiple drops of red color? Just curious if it is on purpose or just by chance.

[@BeardedScienceGuy]

The blue is really dark or the red is really light if you use the same amount.

[@allinoneig2311]

I have seen many videos and all those were nice and it worked. But Which app is used for the thermal camera??

[@BeardedScienceGuy]

I used the Seek Compact Pro Thermal Camera which costs around 500$ and attaches to a smartphone.

[@allinoneig2311]

Oh ok thank you

[@juandelacruz9337]

Question my friend: They say heat desires to move toward the cold, right? If so, in the first test, do you think the heat or hot water desired to move toward the cold, but was prevented due to the density factor of the cold water underneath being more dense? What about in the second test? Did the heat or hot water desiring to move toward the cold water above play a factor? I understand the density part, but it would seem that the heat or hot water would be a factor in the movement of water from one to the other, right?

[@snake4eva]

This is the exact same question i would like answered. The video seems to violate the second law of thermodynamics. Because even if the colors don't mix due to the densities the temperatures need to reach equilibrium to not violate the laws of thermodynamics. What seems to be happening is magical, and I don't believe in magic.

[@DavidDouthett]

I think the density is the determining factor because it affects the surface area of interaction between the hot and cold. In the first experiment, the cold water is denser, so the hot water can't fall into it. Consequently, the only region where the hot and cold can mix is the plane of contact between the two. Compared to the volume of each glass, this is a very small percentage. In the second experiment, since the hot water is less dense, the cold water can fall into it and the two sample mix completely, so the region of mixing is equal to the volume of the two glasses, very much more than in the first case. Given enough time, the first experiment would eventually see the heat transfer from hot to cold, but it would also have the effects of the hot glass losing heat through the sides of the glass to the environment and heat from the environment entering the cold glass. Eventually the two glasses would reach a point where the density was close enough that mixing could begin, I would think, and ultimately the whole system would reach equilibrium with the surrounding environment.

[@ecospider5]

How much salt would you need to add to the hot water to make it denser than the cold. I want to show my niece that it is not Heat that rises. It is less dense liquids rise and hot water is usually less dense but not always.

[@BeardedScienceGuy]

I was pondering the same thing earlier. I bet the hot water would stay on the bottom if you saturate it with salt. You could also use hot water and cold oil and the oil should still be less dense.

[@ecospider5]

Cold oil. Obvious after you say it but I had not thought about that. Brilliant. Thank you.

[@heathery5179]

Hot water and cold water🌪🌪

[@ouanouachannel11thgamerfro16]

Hot+Cold=Warm

[@jave_idk7014]

this is a density test not a mixing experiment, lol

[@snake4eva]

@@jave_idk7014 But the point is correct that due to thermodynamics the temperatures should reach equilibrium. An explanation is needed if this does not happen since that would have implications for the laws of thermodynamics

[@Ceo_RomZ]

UPDT

[@snake4eva]

I understand why the colors don't mix in the case of hot water atop cold water, due to the difference in densities. However, I'm really puzzled about the temperatures not reaching equilibrium on the thermal camera even after 10 mins? Thermodynamics dictates that heat flows from hot to cold body. Even if no heat was flowing between the hot water and the cold water in the glasses, both glasses would be losing heat to the environment and thus the temperature should drop (hot) or be risen (cold) in both glasses. Based on thermodynamics the video is not making any sense. Please explain, using thermodynamics equations if possible, what is happening on the thermal camera when hot water is placed on top of cold water. If this were possible then it seems that the second law of thermodynamics would be violated.

[@Ok-kn9pz]

I cannot use the thermodynamics equations, but I assume that the reason why the temperatures not reaching equilibrium is because of the fact that the youtuber said to make sure to align the cups together accurately. When the cups are aligned perfectly, no outside materials can have contact with the test subject. So then, when there are no outside effects that cool down, it will stay the same. Or it can be something else like density affects more to the test subject rather than the thermodynamics.

[@jereelylopezhernandez4894]

Hot + cold + water = hot water. Then blue + red.🤒

[@SunnySingh-gs4qy]

Why you did not post video regularly love from India😍😍

[@epicboi_lol500]

Image in the alternate timeline it make cobble stone and obsidian from Minecraft

[@jonathancollins3785]

What happens if both jars of water are at the same temperature?

[@trishasharma608]

They will get mixed up.

[@wickthrill2.089]

2:33 OP science

[@robbycass8239]

Do the cups need to be glass?

[@BeardedScienceGuy]

No, not at all.

[@drshahnawazalam2822]

Instead of glass tumblers can I use steel tumblers

[@hayatielove425]

I just wish that cold won

[@julierobledo9289]

I like the content very much, but the music is so loud and distracting!!!!!

[@titikshasoni4708]

When I tried both the colours got mixed ...can someone help me in finding my mistake.

[@BeardedScienceGuy]

Was the one on top at a significantly higher temperature and were they both relatively still (wait a minute after stirring to stack them) ?

[@hambozo2013]

whats the scientific name of it

[@kalpanasaxena7243]

This will only for that till the hot water becomes cold i think...

[@BeardedScienceGuy]

Once the temperature of both is the same the density will no longer be different and the random particle movement will cause them to mix.

[@charleslaw5365]

Universe remember

[@MCInferno]

huh.

[@marwadjerafi4248]

Sir im sorry to bother you i just didn’t get it well U were saying that the density of cold water has what....?

[@BeardedScienceGuy]

Cold water is more dense than hot water.

[@IBAlexanderIB]

"hot water" and "cold water" ok, but... how cold and how hot?.. For all I know it is 20c and 40c water. It is weird to me that you don't think about informing about that before in the middle of the video. Cool experiment though.

[@milli3145]

I'm doing this for my ClAsS!-

[@jamesjames8475]

explain how this experiment relate to the appearance of a tropical cyclone?

[@gwainnn]

nabasag jar ko, ibalik nyo yung jar ko 😓😓😓😓😓😓😓😓😓😓😓

[@pjroy5052]

Density experiment for kids MALAYALAM

[@smartintan]

I'd like to watch it again without the music.

[@shywolfgames5782]

That’s why when I take a bath and I dump the hot water in the cold water and I start washing myself I feel the warm water on one side and the cold water on the other

[@charleslaw5365]

Its actually called youtuber

[@charleslaw5365]

I have lady

[@playerone5506]

Team sub zero

[@gheorghepetean836]

What we actually learned is that red color is stronger then blue color in the water :) :) :) :) :)