Why Hot Water Can Freeze Faster Than Cold (Mpemba Effect)

为什么热水结冰有时比冷水更快（姆潘巴现象入门）

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Under certain conditions, hot water freezes faster than cold—a counterintuitive behavior first noted by a Tanzanian student named Erasto Mpemba.
Possible causes include faster evaporation reducing mass, less dissolved gas increasing convection, and early supercooling differences.

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