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The Mpemba Effect

Although such famous people as Aristotle, Sir Francis Bacon and RenĂ© Descartes described the Mpemba Effect, it is named after Erasto Mpemba, who noticed that, at equal quantities, boiling water will freeze faster than water at room temperature. Although it’s not clear whether or not freezing refers to the formation of visible ice or complete solidification, or what other conditions there were, so the effect remains largely anecdotal. Finally, possible explanations for the phenomenon include the insulating effects of frost, evaporation of the warmer water and different dissolved gasses in the two water samples.

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