Q:

Does hot water freeze faster?

A:

Quick Answer

Hot water sometimes freezes faster than cold water, but there is no definitive answer as to why this occurs. Scientists believe many factors may play a role, such as evaporation, supercooling and dissolved gases.

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Full Answer

Evaporation may play a role because hot water evaporates more than cold water, leaving less water to be frozen and thereby freezing it faster. Less supercooling tends to occur with hot water, allowing it to become solid quicker once it reaches freezing temperature. Hot water often holds less dissolved gases than cold water, which can contribute to it freezing faster. Other possible factors that may contribute to hot water freezing faster than cold water include convection and the effect of the surroundings in which the hot water is located.

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