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Why does hot water freeze faster than cold water

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Hi, Chris. The Mpemba effect is the theory that warmer water can freeze faster than colder water.

The effect has been noted since ancient times but scientists have struggled to explain why it occurs.

A team of Singapore scientists finally think they have solved the mystery and think the secret lies in the unique properties of the bonds that hold water together.

Hydrogen bonds bring individual water molecules into close contact, which triggers natural repulsion between the water molecules and causes the bonds between oxygen and hydrogen atoms to stretch as well as store energy.

So as the liquid warms, it makes the water molecules sit further apart from each other as the hydrogen bonds stretch.

When the molecules shrink again and give up their energy, this results in it cooling, which the scientists say means that warm water cools faster than cold water and explains the Mpemba effect.

You can read more about new research found at this site:

http://www.dailymail.co.uk/sciencetech/article-2483383/Mystery-hot-water-freezes-faster-cold-solved--strange-behaviour-atom-bonds.html


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Thanks very informative!
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You're very welcome.
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It doesn't... Cold water has less heat to lose and thus freezes faster.

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Um WRONG
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it's related to the state of the water because the particles always want to get back back to their original state. So hot water freezes faster than cold water

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Hot water, when cooled, will freeze faster because most of the oxygen has been boiled out. Ask any plumber.

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I did not know that hippy.
Thank you for the enlightenment.
One star pizza to you!
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You're welcome Sumthin and thanks for the pizza.
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Should I say a pepperoni star, lol?
As sissy said once, are we the only ones on the playground right now?
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Could be, I'm on and off this site all day. It's nice to be retired while the others may be at work or school.
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A friend sent this over. it has nothing to do with pizza but it is hilarious!
https://www.youtube.com/watch?v=wKHrBW3keNE
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You old enough to be retired?!
I did not know.
Hubby is thinking of cutting out in a few years at 62.
I already told him when the kids were grown I was opting for early retirement, lol.
And they are.
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That was awesome. Thanks.
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One tough kitty.
I love how he was poised waiting for the guy.
Glad he has a good sense of humor.
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I retired at 58. Best thing I ever did. If the finances are in order, I highly recommend retirement.
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Yeah, we want to get a bit further out into the country too into something we didn't overbuild like we did here.
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Having some computer troubles so if I leave the playground you know why, :P
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Great idea. We kept downsizing as the kids started to leave the nest (4 kids). All of them left home, but my daughter kept coming back. She moved out and came back quite a few times. She finally settled down and bought her own house.
Our plan was to move to the mountains of PA and have just a small house to live out our days in nature.
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That sounds good.
Small house, big garden, lol.
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Yep, my wife was a big time gardener. Unfortunately, she passed away and we were never able to realize our dream. I say go for it, when you can.
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Aww,...I feel for you.
I can't even imagine.
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First, the process of evaporation is endothermic, which means it takes energy for something to evaporate. As a molecule of water evaporates, it leaves the surface of the water and flies into the atmosphere. Thus, in simplified terms, the molecule converted heat energy into kinetic energy (energy of motion). Since the hot water evaporates quicker than the cold water, it loses heat energy quicker than the cold energy.

Second, since some of the hot water evaporates away, there is less water left to have to freeze.

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