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Temperature vs time plots, showing the Mpemba Effect. 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 ...
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.
It's not that the effect occurs under specific conditions that is the issue. Even the Jearl Walker experiment published in Scientific American, and consistently apearing in the papers talking about the Mpemba effect, points out that his results were for two very specific temperatures.
The caption on one states "Mpemba effect experiment: the hot water contained in a thermos, if thrown into the air in a very cold environment, freezes instantly before touching the ground." This is not a very helpful caption for two reasons: 1) water cannot freeze "instantly," and 2) where's the evidence that it freezes before it hits the ground?
There's an egg shortage that has lead to empty shelves in several U.S. states. According to experts, bird flu is by far the biggest factor affecting egg prices right now.
The UFCW local unions that led the "Stop the Merger coalition" argued that the "abrupt" and "massive" share repurchase program comes at a time when Kroger needs investments in staffing, repairs ...
WASHINGTON (Reuters) -FBI Director Christopher Wray and Homeland Security Secretary Alejandro Mayorkas declined to appear publicly on Thursday before a U.S. Senate committee to discuss national ...
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