Water is the liquid of life. We drink it, we bathe in it, we farm, cook, and clean with it. It’s the most abundant molecule in our bodies. In fact, every life form we know of would die without it. But most importantly, without water, we wouldn’t have iced tea. Mmmm, iced tea. Why do these ice cubes float? If these were cubes of solid argon in a cup of liquid argon, they would sink. And the same goes for most other substances. But solid water, a.k.a. ice, is somehow less dense than liquid water. How’s that possible? You already know that every water molecule is made up of two hydrogen atoms bonded to one oxygen atom. Let’s look at a few of the molecules in a drop of water, and let’s say the temperature is 25 degrees Celcius. The molecules are bending, stretching, spinning, and moving through space. Now, let’s lower the temperature, which will reduce the amount of kinetic energy each of these molecules has so they’ll bend, stretch, spin, and move less. And that means that on average, they’ll take up less space. Now, you’d think that as the liquid water starts to freeze, the molecules would just pack together more and more closely, but that’s not what happens. Water has a special kind of interaction between molecules that most other substances don’t have, and it’s called a hydrogen bond. Now, remember that in a covalent bond two electrons are shared, usually unequally, between atoms. In a hydrogen bond, a hydrogen atom is shared, also unequally, between atoms. One hydrogen bond looks like this. Two look like this. Here’s three and four and five, six, seven, eight, nine, ten, eleven, twelve, I could go on. In a single drop of water, hydrogen bonds form extended networks between hundreds, thousands, millions, billions, trillions of molecules, and these bonds are constantly breaking and reforming. Now, back to our water as it cools down. Above 4 degrees Celcius, the kinetic energy of the water molecules keeps their interactions with each other short. Hydrogen bonds form and break like high school relationships, that is to say, quickly. But below 4 degrees, the kinetic energy of the water molecules starts to fall below the energy of the hydrogen bonds. So, hydrogen bonds form much more frequently than they break and beautiful structures start to emerge from the chaos. This is what solid water, ice, looks like on the molecular level. Notice that the ordered, hexagonal structure is less dense than the disordered structure of liquid water. And you know that if an object is less dense than the fluid it’s in, it will float. So, ice floats on water, so what? Well, let’s consider a world without floating ice. The coldest part of the ocean would be the pitch-black ocean floor, once frozen, always frozen. Forget lobster rolls since crustaceans would lose their habitats, or sushi since kelp forests wouldn’t grow. What would Canadian kids do in winter without pond hockey or ice fishing? And forget James Cameron’s Oscar because the Titanic totally would have made it. Say goodbye to the white polar ice caps reflecting sunlight that would otherwise bake the planet. In fact, forget the oceans as we know them, which at over 70% of the Earth’s surface area, regulate the atmosphere of the whole planet. But worst of all, there would be no iced tea. Mmmmm, iced tea.

Why does ice float in water? – George Zaidan and Charles Morton
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100 thoughts on “Why does ice float in water? – George Zaidan and Charles Morton

  • November 14, 2018 at 12:10 am
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    LOL!πŸ˜‚

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  • November 14, 2018 at 7:04 pm
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    hmmm .. iced tea (β™₯). I liked so much this video, thanks for this !!! i loved your voice narrator :3 this video really helpfull.

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  • November 20, 2018 at 9:13 pm
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    Ψ±Ψ§Ψ¦ΨΉ

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  • November 21, 2018 at 7:36 am
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    Awsm explanation

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  • November 25, 2018 at 2:03 pm
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    iced tea hmmmmm.iced tea

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  • November 25, 2018 at 2:26 pm
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    These chemistry people always blames the electrons when something goes unusual

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  • November 28, 2018 at 1:22 am
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    non iced tea comment passing by

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  • November 29, 2018 at 4:35 pm
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    Thank u sir.

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  • November 30, 2018 at 7:25 pm
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    What is there inside the cage like structure of two molecules of water?? Air/vacuum/or something else ??

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  • December 6, 2018 at 6:15 pm
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    Mmmmm… Iced tea

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  • December 8, 2018 at 6:35 pm
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    What about ice coffee ☹️

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  • December 11, 2018 at 12:59 pm
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    So you care Moro about ice tea than you care about earth

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  • December 18, 2018 at 4:34 pm
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    Ice tea πŸ™‚

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  • December 19, 2018 at 7:07 pm
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    0:42 Oh the lookouts spotted the iceberg early enough
    WAIT 42 SECONDS

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  • January 1, 2019 at 1:52 pm
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    I think you are the biggest fan of ice teaπŸ˜‚πŸ˜‚πŸ˜‚

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  • January 1, 2019 at 10:28 pm
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    Thanks a lot this is on my test and this was the only good vid on this topic

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  • January 2, 2019 at 7:23 am
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    😚thnx

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  • January 2, 2019 at 4:48 pm
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    After 5 minutes of reading the comments, I found only 5 without a reference to the iced tea thing, lol.

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  • January 4, 2019 at 5:40 am
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    Looks like u love ice tea…

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  • January 6, 2019 at 4:27 am
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    Amazing.sir the way you understand is awesome. .thanks for removing my confusion.

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  • January 8, 2019 at 4:58 pm
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    Very well explained..!!

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  • January 8, 2019 at 7:27 pm
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    Titanic was a false flag, proove me wrong.

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  • January 9, 2019 at 2:41 am
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    i like your ice tea hmmmm….. oce tea!πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚

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  • January 9, 2019 at 9:26 am
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    Antanai anglu nelabai

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  • January 9, 2019 at 2:54 pm
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    Big question which I had is solved now.
    Thank you.

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  • January 9, 2019 at 8:40 pm
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    sub to my channel plz

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  • January 10, 2019 at 2:39 am
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    Lol I was drinking iced tea and saw the ice floating, So i looked up this vid and they showed iced tea πŸ˜€

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  • January 12, 2019 at 8:35 am
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    Lovely video # ice tea sir πŸ™„πŸ™„

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  • January 13, 2019 at 3:57 pm
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    Mmm ice tea

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  • January 19, 2019 at 7:42 am
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    Thank u soo much for this vedio

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  • January 22, 2019 at 1:26 pm
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    but there would still be iced tea even if the ice cubes sink?

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  • January 23, 2019 at 6:23 am
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    great video and animation

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  • January 31, 2019 at 5:38 pm
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    Hmm… Ice teaπŸ˜‚πŸ˜‚πŸ˜πŸ€£

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  • February 3, 2019 at 1:18 am
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    1) I'm pretty sure you could still have iced tea? But the ice would just be at the bottom, like boba
    2) Iced tea sucks

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  • February 5, 2019 at 9:31 pm
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    God's creation is the greatest.

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  • February 6, 2019 at 8:09 pm
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    I have not seen a single comment under this video that has not mentioned iced tea

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  • February 9, 2019 at 5:20 am
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    He has a fetish for ice tea. ;-;

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  • February 10, 2019 at 6:02 pm
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    Mmmmm… iced tea.

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  • February 11, 2019 at 7:06 am
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    Cool!

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  • February 11, 2019 at 1:08 pm
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    then i started to think "does ice cubes are good to our health? based on the ice cubes structures and the energy inside it?"

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  • February 19, 2019 at 6:47 pm
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    cool!!!

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  • February 26, 2019 at 12:29 pm
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    It's important but no too much useful

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  • February 27, 2019 at 1:27 pm
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    Wazzup iced tea

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  • February 28, 2019 at 1:22 am
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    He got an Iced Tea fetish

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  • March 2, 2019 at 9:10 am
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    β€œMmm, iced teaπŸ˜‹β€

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  • March 3, 2019 at 1:44 am
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    And that’s why waters not wet

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  • March 4, 2019 at 3:52 pm
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    ice tea
    mmmmm

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  • March 15, 2019 at 3:54 am
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    Ice teaπŸ˜πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚

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  • March 16, 2019 at 2:31 pm
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    High school boys and girls:
    "Are we joke to you?"

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  • March 19, 2019 at 10:45 am
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    Superb concept

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  • March 21, 2019 at 12:11 pm
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    Mmmm. Iced tea.

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  • March 23, 2019 at 6:53 pm
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    So, ice water remains less dense than warmer water?

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  • March 24, 2019 at 7:19 pm
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    Interesting

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  • March 26, 2019 at 9:28 pm
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    ice tea

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  • April 4, 2019 at 11:03 pm
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    Iced tea would be fine, the ice would just be at the bottom

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  • April 6, 2019 at 11:43 pm
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    what editing app used?

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  • April 13, 2019 at 4:34 pm
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    Nicely explained

    Reply
  • April 14, 2019 at 4:10 am
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    πŸ˜‚Worst of all no iced tea!

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  • April 14, 2019 at 4:46 pm
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    very clear video, thanks

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  • April 14, 2019 at 5:59 pm
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    the bwginning reminded me of a bill wurtz video

    also 2:53 – 2:57

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  • April 17, 2019 at 7:32 am
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    @TED-ED sir can u tell me which software you are using for chemistry animations….

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  • April 21, 2019 at 12:54 am
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    breaks like high school relationships….. quickly omg lmao

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  • April 22, 2019 at 3:54 pm
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    iced tea<3

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  • April 22, 2019 at 4:13 pm
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    Which video editing app you used in your videos please tell me …….

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  • April 23, 2019 at 12:43 am
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    Fields , fire, cold temps, igloos…
    Think about the fields instead of the feelings.
    Water is dielectric and repels other fields,
    This is why induction electrolysis will world better than
    Electrodes in water, The water sits away from electrodes when voltage is applied, leading to poor hydrogen production..
    A guy has already showed it using radio waves on a test tube full of salt water for huge instant hydrogen production, Glass ( crystal )
    Amplifies..

    Reply
  • April 26, 2019 at 8:47 am
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    I’m gonna be the first comment not about ice tea

    This video was good (I can’t do it) ice tea is good

    Reply
  • May 2, 2019 at 11:04 pm
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    Lol

    The first seven comments that I saw were about iced tea

    Reply
  • May 3, 2019 at 4:06 am
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    This is the most uninformative non descriptive video claiming to be expert I’ve ever seen.

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  • May 10, 2019 at 11:10 am
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    Ice tea !!!

    Reply
  • May 11, 2019 at 7:26 am
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    He protecc
    He attacc
    But most importantly, iced tea is what he drincc

    Reply
  • May 18, 2019 at 4:40 am
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    Give this man a ice tea

    Reply
  • May 18, 2019 at 4:41 am
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    Is this video sponsored by ice tea 🀐😝😝

    Reply
  • May 22, 2019 at 10:25 pm
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    β€œHigh school relationship..they break..quicklyβ€πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚πŸ˜‚

    Reply
  • May 28, 2019 at 2:18 pm
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    What happens if the ice is cooled below 0℃ (1 atm)?
    Will the volume of ice decrease or increase.

    Reply
  • May 31, 2019 at 12:03 am
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    Trust me, if the guy who invented ice tea decided to take a complete u-turn before it was invented, then this guy would never had been born.

    Reply
  • May 31, 2019 at 9:42 am
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    iiiiiiiiiiiccccccccccccccceeeeeeeeeeeeeeeee ttttttttttttttttteeeeeeeeeeeeeeeeaaaaaaaaaaaaa mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

    Reply
  • June 1, 2019 at 4:28 am
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    Thats logical answer

    Reply
  • June 11, 2019 at 12:39 am
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    How to torture your viewer :
    Form and break like High School relationships.

    Reply
  • June 13, 2019 at 3:35 pm
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    I feel… violated on behalf of the poor, iced tea

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  • June 19, 2019 at 10:33 am
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    Lost in feeling – umm ice tea..

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  • June 19, 2019 at 12:29 pm
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    no such htin gas breakx or quicklyx or not about it, idts

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  • June 21, 2019 at 12:23 am
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    uuuum….. Im so sorry, the way he says, 'mmmmm…. iced tea' ijust makes me laugh! Its just so creepy and funny at the same time!

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  • June 25, 2019 at 7:42 am
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    So fun!

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  • July 1, 2019 at 1:22 pm
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    Ice alcohol

    Reply
  • July 5, 2019 at 9:09 pm
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    what fills the space in between the atoms when they crystalise?

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  • July 13, 2019 at 10:29 am
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    Damn you really like ice tea

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  • July 15, 2019 at 1:01 pm
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    *MmMmMm*…Iced tea.

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  • July 18, 2019 at 8:24 am
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    There will be iced tea, except the ice doesn't float

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  • July 23, 2019 at 2:48 am
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    mmm iced tea

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  • July 23, 2019 at 3:43 pm
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    nice one

    Reply
  • July 23, 2019 at 8:08 pm
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    Wtf mine sinks

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  • July 27, 2019 at 4:12 am
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    U just love ice tea…

    Reply
  • July 27, 2019 at 2:49 pm
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    This senario with hypothetical will had non existing ice tea i think it s not real,actualy in every ice liquid drink in the world with density smaller than water like my staring ice coffe (which has the effect of being mixed up with air bubbles) the water s ice cubes are sink into the liquid but the liquid remanes ice

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  • July 28, 2019 at 9:44 am
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    hahahahahaha i like this George Zaidan guy

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  • August 5, 2019 at 4:48 pm
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    99% of comments "iced tea"
    1% of comments i like this vid

    Reply
  • August 7, 2019 at 7:46 am
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    Your video reminds me of Homer Simpson drooling for ice tea… MMMmmmmmmmm ice tea..*grunting* grunting

    Reply
  • August 12, 2019 at 9:19 am
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    So air dies without water

    Reply
  • August 19, 2019 at 8:09 am
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    This was a great talking point in my thermodynamics class about how in the choas of the universe, such a small think allows life to be sustained here. Believe what you want but i find this to be divine.

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  • August 20, 2019 at 7:29 pm
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    Mmmmm….. Ice Tea! Mmmmmm!

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  • September 1, 2019 at 7:33 am
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    I think title is wrong πŸ˜’
    It may '"why ice float on water not in water?
    If you agree then like .

    Reply

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