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Why does hot water freeze faster than cold water?

MrBates2

MrBates2

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Solve Scientific Mystery, Get $1600 Reward
By MSN Now

June 27, 2012

Updated Jun 27, 2012 at 11:59 AM PDT

A scientific phenomenon has stumped scientists for centuries -- even Aristotle couldn't crack it. Now the frustration has grown so unbearable that the brainiacs are turning to you, yes you, to help solve the mystery of why hot water freezes faster than cold water.

If anyone can make a "convincing case," they could pocket a $1,600 reward.

Hurry up and get your H20 know-how in check as you only have until July 30 to submit ideas to The Royal Society of Chemistry in London.
The winner will need to "employ some creative thinking," said the society's Brian Emsley, as many theories have been proposed over the years but none proven.

Break out the ice trays and start tinkering!
 
I don't know that hot water does freeze faster than cold water, but, if it does, I would guess that the higher speed of Brownian motion in the molecules allows hot water to settle into crystalline form faster. I recall from HS chemistry that there is such a thing as "supercooled water" -- below freezing temperature but still liquid.
 
higher mineral content is my guess

I'd never heard of this
 
I remember a while back there was this huge argument over the whole thing about an airplane taking off from a runway that is moving in the opposite direction. No matter how many times it was explained to people they still didn't get it. Hell, even after Mythbusters proved it, people still said it couldn't be.
This thread reminds me of that. Not exactly because so far there is no real correct answer but it's close because you can see the stupid coming on.
 
Hot water loses mass faster than cool water, so there's less water to freeze inside the hot container. The other part of it is, the greater the temp difference the faster the heat flow from the hotter water to the cooler environment.

This said, the results depend on how close to freezing the cool water is. If its temp is 33 degrees, no way in hell can boiling water shed mass fast enough to get to 32 degrees first.
 
Last edited by a moderator:
KRCummings said:
I remember a while back there was this huge argument over the whole thing about an airplane taking off from a runway that is moving in the opposite direction. No matter how many times it was explained to people they still didn't get it. Hell, even after Mythbusters proved it, people still said it couldn't be.
This thread reminds me of that. Not exactly because so far there is no real correct answer but it's close because you can see the stupid coming on.
Click to expand...

The runway was moving the opposite way?

That wouldn't matter.

I should be a myth buster.
 
semen4her said:
The runway was moving the opposite way?

That wouldn't matter.

I should be a myth buster.
Click to expand...

Mythbusters proved it doesn't matter but on their website people had a fit over it, saying they were wrong. I think they did a second show just to shut them up like they sometimes do.
People on here were doing the same, they just coudn't grasp how a plane works.
 
semen4her said:
The runway was moving the opposite way?

That wouldn't matter.

I should be a myth buster.
Click to expand...

It was... airplanes can fly with zero ground speed, it's the air over the wings generating lift that cause a plane to take off... same principal is why carriers turn into the wind and gain speed to launch their planes
 
KRCummings said:
I remember a while back there was this huge argument over the whole thing about an airplane taking off from a runway that is moving in the opposite direction. No matter how many times it was explained to people they still didn't get it. Hell, even after Mythbusters proved it, people still said it couldn't be.
This thread reminds me of that. Not exactly because so far there is no real correct answer but it's close because you can see the stupid coming on.
Click to expand...

What?!

Link?
 
KRCummings said:
Mythbusters proved it doesn't matter but on their website people had a fit over it, saying they were wrong. I think they did a second show just to shut them up like they sometimes do.
People on here were doing the same, they just coudn't grasp how a plane works.
Click to expand...

Have it going the opposite way on a landing.

That could get interesting.
 
KRCummings said:
I remember a while back there was this huge argument over the whole thing about an airplane taking off from a runway that is moving in the opposite direction. No matter how many times it was explained to people they still didn't get it. Hell, even after Mythbusters proved it, people still said it couldn't be.
This thread reminds me of that. Not exactly because so far there is no real correct answer but it's close because you can see the stupid coming on.
Click to expand...

Its not a difficult problem to solve if you know the relevant laws.
 
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