Why does boiling water freeze faster than room-temp water?
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This is very dependent on conditions.
If you pour out boiling water on a cold surface, some of it will evaporate and the rest will spread out more thinly than the same volume of colder water, so you have more thermal contact with less water and it can freeze faster.
If you put a cup in a freezer, the hot water has more heat to lose, so it will take longer to freeze.
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