There are several things that help the hot pail freeze faster than the cold pail. Here are what is thought to be the most significant factors: Water in the hot water pail evaporates at a much faster rate than the cold water. This does two things. Hot Water Freezes Faster Than Cold It's true. Find out why.
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library.thinkquest.org/C008537/cool/freeze/freeze.html
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Cooling faster" fallacy. A common mis-explanation of the effect is that hot water cools quicker than cold
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en.wikipedia.org/wiki/Mpemba_effect
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Just a few days after I read your column on whether hot water freezes faster than cold water (you said it didn't), I happened to come across an article in Scientific American entitled "Hot Water Freezes Faster Than Cold Water.
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www.straightdope.com/columns/read/422/which-freezes-fas...
www.straightdope.com/columns/read/422/which-freezes-faster-hot-water-or-cold-water
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"Hot water freezes faster than cold water. Why does it do so?", Jearl Walker in The Amateur Scientist, Scientific American, Vol. 237, No. 3, pp 246-257; September, 1977. One of the 350 questions discussed in their archive is Is it true that hot water placed in a freezer freezes faster than cold water? And if so why...
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www.wiskit.com/marilyn/freezing.html
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Among the myths circulating about water are that hot water freezes faster than cold water, and cold water boils faster than hot water. But there may be a bit of truth to these claims after all. Hot water freezes faster than cold water. Most experts say that, all things being equal, cold water freezes faster.
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itotd.com/articles/521/water-freezing-and-boiling-myths...
itotd.com/articles/521/water-freezing-and-boiling-myths/
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"To the first part of the question--'Does hot water freeze faster than cold water?'--the answer is 'Not usually, but possibly under certain conditions.' It takes 540 calories to vaporize one gram of water, whereas it takes 100 calories to bring one gram of liquid water from 0 degrees Celsius to 100 degrees C.
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www.scientificamerican.com/article.cfm?id=is-it-true-th...
www.scientificamerican.com/article.cfm?id=is-it-true-that-hot-water
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Although detailed research has been done on some specific cases where hot water freezes faster than cold, the classic experiment with pails of water "Hot water freezes faster than cold water. Why does it do so?", Jearl Walker in The Amateur Scientist, Scientific American, Vol. 237, No. 3, pp 246-257; September, 1977.
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ivantic.apnoia.org/fizika/faq/hot_water.html
ivantic.apnoia.org/fizika/faq/hot_water.html
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Article about experiment with freezing water. Does Hot Water Freeze Faster Than Cold? Article #650 "How come my hot water pipes always freeze up before my cold water pipes?" And "How come when I put out glasses of hot and cold water when it's - 40°F, the hot water freezes first?"
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www.gi.alaska.edu/ScienceForum/ASF6/650.html
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The Mpemba Effect is a special phenomenon where hot water freezes faster than cold water. The discovery of this effect was made by a high school student named Mpemba in Tanzania, Africa in 1969. He noticed this phenomenon while making ice cream and was curious enough to make note of it.
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www.school-for-champions.com/science/mpemba.htm
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