Which freezes faster hot water or cold water?

Question: Which freezes faster hot water or cold water?

Surprisingly hot water can freeze faster than cold water under certain conditions, a phenomenon known as the Mpemba effect. This effect is named after Erasto Mpemba, a Tanzanian student who observed this phenomenon in 1963.

There are several theories as to why this happens, including:

- Evaporation: Hot water can lose mass due to evaporation, which means there's less water to freeze.

- Convection currents: Hot water can set up convection currents that might allow it to cool faster.

- Supercooling: Hot water might be less likely to supercool (cool below its freezing point without forming ice), thus starting to freeze sooner.

While the Mpemba effect is not fully understood and doesn't always occur, it has been observed in various experiments.

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