Mpemba effect
The observation that, under some conditions, initially warmer water can freeze before cooler water. It is not universal and is sensitive to factors such as the container, evaporation, convection, and dissolved substances.
Hot water can freeze faster than cold — a phenomenon called the Mpemba effect. Known since Aristotle but still unexplained, it was named after Tanzanian student Erasto Mpemba, whose question physicist Denis Osborne took seriously enough to research together.
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