Why hot water freeze faster than cold water?

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shige2salva

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Why hot water freez faster than cold water?
 

Re: colling system

Is that a fact? What does hot water mean? Higher energy given to the molecules of water. So there movement becomes more intenced and there reaction to each other ends up with more heat.

Now suppose we cut the warming factor( the device that offers energy to the molecules) and we replace it with a coolling device. Colling device will detact energy from the water molecules. But as we have allready offered higher energy to them, they will interact with the coolling device with higher rate than an allready "cold" ( lower energy status) water. There energy will be deducted on a higher rate and therefore it will freeze faster.
I hope it is correct. Anyone to second this?

D.
 

colling system

hello,

Yes, that's a fact, and is known as Mpemba effect.
You'll obviouslly not see it if you start with water at 90º and water at 2º, but it can be verified under a range of initial temperatures.
As far as I know, there is no clear explanation of the Mpemba effect, but it can be related to convection currents, evaporation and less dissolved gasses in the warmer water.

Best regards!
 

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