Re: Mpemba effect" ??

[Robert A Cohen <bbq@ESU.EDU>]

When you say "same amounts of water", do you mean same amounts initially
or same amounts after evaporation has taken place (I'm guessing more of
the warm water will evaporate)?

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| Robert Cohen               Department of Physics       |
|                            East Stroudsburg University |
| bbq@esu.edu                East Stroudsburg, PA  18301 |
| http://www.esu.edu/~bbq/   (570) 422-3428              |
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On Fri, 16 Feb 2001, Savinainen Antti wrote:

> My student did an Extended Essay on the topic few years ago in the
> International Baccalaureate program.
> She monitored cooling and freezing of the same amounts of water in the same
> freezer in different kinds of containers. She used a computer based measurement
> of temperature. I didn't believe in the effect before I saw how initially
> warmer water actually did froze faster that colder water. The (initially)
> colder water spend more time in a super cooled state under 0 degrees of Celsius.
> Then the temperature raised to zero and started to drop again after all the
> water had frozen. This took place repeatedly for certain kind of containers.
> Why this happened remained a mystery.