From Wikipedia, the free encyclopedia.The Mpemba effect is the somewhat surprising phenomenon whereby hot water can, under certain conditions, freeze faster than cold water.
The effect is named for its rediscoverer, the Tanzanian high-school student Erasto B. Mpemba. He first noticed the effect in 1963 after observing the freezing of ice cream in cookery classes, and went on to publish experimental results with Dr. Denis G. Osborne in 1969.
At first sight, the effect is contrary to Newton's law of cooling. Despite this, it has been widely reproduced in controlled experiments, although it is still poorly understood.
The effect is not universal under all experimental conditions, so its exact requirements have proved difficult to specify.
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