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The Mpemba effect is the name given to the observation that a liquid (typically water) that is initially hot can freeze faster than the same liquid which begins cold, under otherwise similar conditions. There is disagreement about its theoretical basis and the parameters required to produce the effect.
Erasto Bartholomeo Mpemba [1] (1950–2023) [note 1] was a Tanzanian game warden who, as a schoolboy, discovered the eponymously named Mpemba effect, a paradoxical phenomenon in which hot water freezes faster than cold water under certain conditions; this effect had been observed previously by Aristotle, Francis Bacon, and René Descartes.
The 'recent view of the Mpemba effect' was put in as balance as recent papers still remain undecided over the reason for the Mpemba effect, at least there is no consensus in the recent scientific literature; the reasons still being given are in the 'Causes' section of the article.
Download QR code; In other projects ... English: Graph of freezing rates for two water samples to demonstrate the Mpemba effect.
Download as PDF; Printable version; In other projects ... Field effect (semiconductor) Flowability; Free neutron decay; ... Mpemba effect; N. Negative refraction ...
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The Mpemba Effect relates to hot water freezing faster than cold water in certain circumstances, none of which is identified as having been thrown up in the air. Also, while the Mpemba Effect is not well understood, the trick of throwing hot water into very cold air so that it quickly vaporizes and then condenses into small droplets and freezes ...