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Mr Mpemba, who had been studying the problem for five years, had asked Professor Denis Osborne, of Dar es Salaam University: 'If you take two similar containers with equal volumes of water, one at 35C and the other at 100C, and put them in a refrigerator, the one that started at 100C freezes first. Why?'
The professor was unable to answer and published a paper on the problem the following year, calling it the 'Mpemba Effect'.
Originally posted by Threegirls
reply to post by auraelium
Water vapour would be my guess.
The warmer water molecules begin to evaporate, whilst separate from the body of water they freeze and sink. This happens repeatedly until the water cools by which time the molecules have reached freezing temperature quicker.
This was posted already.