Did You Know? Hot water will turn into ice faster than cold water.

Yes, that’s true! The phenomenon of hot water turning into ice faster than cold water is known as the Mpemba effect1. It was named after a Tanzanian student who observed his hot ice cream mix freezing more rapidly than the hard version 1. Separating homemade ice cream into ice cube trays also speeds up freezing1.


The Mpemba effect is still not fully understood by scientists and there are many theories about why it happens. One idea is that hot water evaporates more quickly than cold water, which reduces the amount of water that needs to be frozen2. Another theory is that hot water has less dissolved air than cold water, making it easier to freeze3.

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