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Why Hot Water Freezes Faster Than Cold

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Jamie D:
Why Hot Water Freezes Faster Than Cold—Physicists Solve the Mpemba Effect

* Aristotle first noticed that hot water freezes faster than cold, but chemists have always struggled to explain the paradox. Until now.

Water may be one of the most abundant compounds on Earth, but it is also one of more mysterious. For example, like most liquids it becomes denser as it cools. But unlike them, it reaches a state of maximum density at 4°C and then becomes less dense before it freezes.

In solid form, it is less dense still, which is why standard ice floats on water. That’s one reason why life on Earth has flourished— if ice were denser than water, lakes and oceans would freeze from the bottom up, almost certainly preventing the kind of chemistry that makes life possible.



Then there is the strange Mpemba effect, named after a Tanzanian student who discovered that a hot ice cream mix freezes faster than a cold mix in cookery classes in the early 1960s. (In fact, the effect has been noted by many scientists throughout history including Aristotle, Francis Bacon and René Descartes.)

Full article at the link

(It's all in the bonds)

Jessica Merriman:
Can you work on this whole Gender Dysphoria thing now, please? *giggle*  :D

Jamie D:
I think I would rather sit in the jacuzzi, set at about 102F.

Miss_Bungle1991:

--- Quote from: Jamie D on December 30, 2013, 03:35:19 am ---I think I would rather sit in the jacuzzi, set at about 102F.

--- End quote ---

OUCH!

LordKAT:
Without reading the article, I blame Newton and his laws.

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