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Why does Boiling water freeze faster than cold water.

 
Anonymous Coward
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12/25/2012 10:07 AM
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Re: Why does Boiling water freeze faster than cold water.
even more clues, if you freeze an inoculative material it no longer is an insulator, it becomes a conductor of heat, due to the atoms being more close together.


Yes its christmas, and I don't give a fuck...
Anonymous Coward
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12/25/2012 10:08 AM
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Re: Why does Boiling water freeze faster than cold water.
Evaporation?

That's why it's also easier to dry yourself off after a warm shower than a cold shower.

Too bad a warm shower opens up skin pores and a cold shower closes them.

DAMN YOU PHYSICS!
 Quoting: Anonymous Coward 15993935


pours do not open or close...
Anonymous Coward
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12/25/2012 10:14 AM
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Re: Why does Boiling water freeze faster than cold water.
[link to www.rsc.org]


Why does hot water freeze faster than cold water?

It seems a simple enough question - yet it has baffled the best brains for at least 2,300 years.

Aristotle agonized over it fruitlessly in the fourth century BC

Roger Bacon in the 13th century used it to advocate the scientific method in his book Opus Majus

Another Bacon, Francis, wrote in his 1620 Novum Organum, that "slightly tepid water freezes more easily than that which is utterly cold" but could not explain why

Descartes was defeated by it in the 17th century AD

Even perplexed 20th and 21st century scientists and intellectuals have swarmed over it without result

 Quoting: The Scientist


i heard this question a lot of times,
to me it actually seems quite obvious, why the boiling water freezes first:

lets assume the water as a block,
1. in cold water, molecules freeze from outside to inside

2. in boiling water molecules are more free to change their position, which means that molecules from inside "travel" to outside of our "block" exposing themselves to cold, and travel inside again, transporting the cold inside too. and so, cooling the inside faster then in cold water.

3. in boiling water also the space between molecules increases, allowing more cold to enter our water.

you could argue, that first water cools down, and then, becomes cold water first, and it shouldnt be freezing faster then.
however, if its cold enough around, the boiling water molecules exposed to the cold, start freezing immediately, and transporting the cold inside, thus triggering a faster freezing.
in cold water however, the process of freezing is slower, as "the system" is kept "warm" from inside...

i am sure, this is the correct answer.
if you post it somewhere, do not forget to claim your nobelprize ;)
kennyrules2005

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12/25/2012 10:17 AM
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Re: Why does Boiling water freeze faster than cold water.
Boiled water and its because it removes the excess oxygen molecules, thus letting the water to form clearer more molecularly organized ice. It makes it easier and faster to freeze, less energy.
~ Time devours all things, nothing ever stays the same so why get upset when it inevitably changes. Everything is as it should be. Just go with the flow of life. ~
Anonymous Coward
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12/25/2012 10:18 AM
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Re: Why does Boiling water freeze faster than cold water.
As a general rule, boiling water does not freeze faster than cold water.

It's a myth.

Yes, there can be exceptions if the two water samples are not identical, but then that's a contaminated experiment. The water composition must be exactly the same in order to rule out compositional variables that may change the freezing point of the water.
Anonymous Coward
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12/25/2012 10:25 AM
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Re: Why does Boiling water freeze faster than cold water.
Don't know how it works, but just for fun I threw a cup of boiling distilled water off the back deck just now.

Came down a beautiful frozen icefall.

Oh yeah, outside temp is currently -25c.

This could keep the kids amused for 15 min or so and get their little brains working on the puzzle.

Excellent, learning and fun all rolled into one.

5a
Anonymous Coward
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12/25/2012 10:36 AM
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Re: Why does Boiling water freeze faster than cold water.
I'm taking your word that it freezes faster, but..
When water is liquid, the 120degree shape of water molecules allows them to spoon up and lay together in the closest order, but when it freezes, it forms a matrix where everything is the farthest apart. (which is why ice takes more volumn than water) Maybe heated water molecules can move easier into this matrix than water molecules that are just sitting around cold.
Imagine a classroom full of rambunctious kids and the teacher tells them to take their seat. It doesn't take long if they run to their seat. But imagine a highschool class full of pot inbibing seniors, just mulling around, and telling them to take their seat. It takes a while for them to move into the seat matrix.
Anonymous Coward
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12/25/2012 11:03 AM
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Re: Why does Boiling water freeze faster than cold water.
The reason is the difference in energy potential.

For example, if you have a container with 2 sealed chambers (One filled with water one empty) and open a gate between them the water will fill the empty side at a determinable speed.

Now, if you lower the the pressure on the empty side, the water will literally be sucked into the empty container. If you pressurize the water side, the same will happen.

What we have, speaking in energy potential, with boiling water freezing faster is essentially a pressurized source discharging into a vacuum. It is only logical that it would lose its energy faster and freeze quicker.
Anonymous Coward
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12/25/2012 11:27 AM
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Re: Why does Boiling water freeze faster than cold water.
Easy

Hot water is small
Cold water is big


for example. Teabag in a glass. Pour hot water; the tea seeps out of the bag.

Pour cold water; the tea stays in the bag.

They cold water is bigger than the perforations in the bag.


Hot water is smaller! Obviously. Make it hotter and it turns to steam. Evaporates.


So when he throws the cold water it takes more time to freeze cause its bigger. Hot water has less to freeze so its faster..
Anonymous Coward
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12/25/2012 11:33 AM
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Re: Why does Boiling water freeze faster than cold water.
I think it could be down to the dissolved oxygen in the water, and the warmer the water the less dissolved Oxygen.

I'm thinking there is less mass to freeze or the dissolved Oxygen has an insulating effect.

As a way to test simply boil two cups of water to get all the dissolved Oxygen out of the water, Allow one cup to cool...then try the experiment. If I'm correct both will freeze at the same time if not then my theory is fucked lol.
Eagle # 1
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12/25/2012 11:33 AM
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Re: Why does Boiling water freeze faster than cold water.
Read ONLY the question, NONE of the replies. IMHO it would be because most of the air has been removed from between the water molecules, therefore easier for them to 'join up' as ice molecules.

Eagle
Anonymous Coward
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12/25/2012 11:35 AM
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Re: Why does Boiling water freeze faster than cold water.
Why are vehicles cooling systems pressurized ?

Every PSI raises the boiling point by 7 degrees.

Now, you know.
 Quoting: Anonymous Coward 17487177


Yet this has baffled scientists for 2300 years? The experiement is done at the same sea level.
Anonymous Coward
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12/25/2012 11:35 AM
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Re: Why does Boiling water freeze faster than cold water.
Simple...it doesn't
Anonymous Coward
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12/25/2012 11:47 AM
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Re: Why does Boiling water freeze faster than cold water.
Simple...it doesn't
 Quoting: Anonymous Coward 22366517



Some of it does, it freezes and then fractures. The rest evaporates.
Maipenrai

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12/25/2012 11:49 AM
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Re: Why does Boiling water freeze faster than cold water.
If you keep 2 containers with the same weight of water, the cold water freezes faster than hot water.

But interestingly at the "triple point" water can exist simultaneously as a solid liquid and a gas. This combination occurs at exactly 273.16 K (0.01 °C) and a partial vapour pressure of 611.73 pascals.
Anonymous Coward
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12/25/2012 11:51 AM
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Re: Why does Boiling water freeze faster than cold water.
zamboni drivers pour hottish water on the ice rinks
Anonymous Coward
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12/25/2012 11:52 AM
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Re: Why does Boiling water freeze faster than cold water.
1.21 gigawatts
 Quoting: ANHEDONIC


great Scott
SuperManny

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12/25/2012 12:00 PM

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Re: Why does Boiling water freeze faster than cold water.
Momentum!
The greatest gift you can give anyone is the example of your own life working. -Orin
Dukembg

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12/25/2012 12:03 PM

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Re: Why does Boiling water freeze faster than cold water.
Boiling water has more surface area for energy transfer and cools faster.. cold water has less surface area
mrmuffins69
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12/25/2012 12:12 PM

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Re: Why does Boiling water freeze faster than cold water.
1.21 gigawatts
 Quoting: ANHEDONIC

Anonymous Coward
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12/25/2012 12:16 PM
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Re: Why does Boiling water freeze faster than cold water.
My guess is that it's because the non hot water is more dense, and the hot water molecule have more free movements. The hot water molecules are more individual, thus can dissipate the heat easier.
CE1
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Re: Why does Boiling water freeze faster than cold water.
1.21 gigawatts
 Quoting: ANHEDONIC


I heard it is up to Terrawatts now!

ZAP!
Anonymous Coward
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12/25/2012 01:21 PM
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Re: Why does Boiling water freeze faster than cold water.
Jeez.... this isn't baffling at all.

Hot water Separates into smaller droplets when it's thrown. Smaller droplets freeze faster.
Anonymous Coward
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12/25/2012 02:03 PM
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Re: Why does Boiling water freeze faster than cold water.
creamofsomeyoungguy.
JoeJett

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12/25/2012 02:24 PM

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Re: Why does Boiling water freeze faster than cold water.
The faster you move, the heavier you are.

Step on a scale.

Now, jump on it.

Inertia is a wonderful thing.
 Quoting: Anonymous Coward 17487177


you owe me a new scale and 2 new tiles to my bathroom floor
 Quoting: Brad Daylight


1rof11rof11rof1dubyagwdance
Anonymous Coward
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12/25/2012 03:02 PM
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Re: Why does Boiling water freeze faster than cold water.
1.21 gigawatts
 Quoting: ANHEDONIC


cruise
Anonymous Coward
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12/25/2012 03:24 PM
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Re: Why does Boiling water freeze faster than cold water.
Evaporation?

That's why it's also easier to dry yourself off after a warm shower than a cold shower.

Too bad a warm shower opens up skin pores and a cold shower closes them.

DAMN YOU PHYSICS!
 Quoting: Anonymous Coward 15993935


pours do not open or close...
 Quoting: Anonymous Coward 30664251


Widen, narrow, choose your terminology. If you seriously didn't understand - then you have an issue.
Anonymous Coward
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12/25/2012 03:38 PM
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Re: Why does Boiling water freeze faster than cold water.
Here is my simple PHYSICAL (Physics) explanation to whats happening.


Imagine Water molecules as cars , the faster the car drives when a car crashes into another car the greater the force exerted on the frame of the car therefore the quicker (FASTER) the cars slow down on impact.


Whereas slower cars that hit each other the energy is absorbed like a shock absorber and therefore provides a spring back effect.


Upon impact high speed cars or molecules suffer from a different type of stress on the bonds in a similar way a car frame would.



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 Quoting: Anonymous Coward 19706474



pin this!!!

not
Veresanctus

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12/25/2012 03:49 PM
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Re: Why does Boiling water freeze faster than cold water.
boiling water evaporates, less water freezes faster than more water
 Quoting: Anonymous Coward 29757648


I personally think it is because the hotter a liquid or gas is the more the molecules move around. Also when a liquid boils it causes the liquid to circulate inside of the container. Now the reason I think that causes the water to freeze faster is because of the amount of molecules that are directly touching the cold air as opposed to only the water on top getting direct contact and then cooling the other molecules below it. At least that is the only logical explanation I can think of.
 Quoting: Anonymous Coward 30747832


I've always assumed it was because the greater gradient in temperature change.

Sort of like the difference between rolling a ball down a steep hill and a steeper hill; same energies involved, but a faster process.
 Quoting: Smith Jefferys


i'll try to explain.

Heat acts as a catalyst for the reaction taking place, we know that, so my theory is that the heat energy in hot water is more easily conducted away from the water, speeding up the reaction.
 Quoting: Anonymous Coward 30664251


faster heat loss
 Quoting: Anonymous Coward 30776066



EVAPORATION! ... As many have picked up on the reason is simple when a hot liquid is suddenly exposed to freezing environment since it is already evaporating it loses it's heat faster especially if thrown because of increased surface area (it boils in the air notice all the steam) and then freezes faster, than a cool liquid.

SOLVED!


Last Edited by Veresanctus on 12/25/2012 03:51 PM
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