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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?
(de Sitter effect: see) Geodetic effect (general relativity) Debye–Falkenhagen effect; Decoy effect (consumer behavior) (decision theory) (economic theories) (finance theory) (marketing) Delay (audio effect) (audio effects) (effects units) (musical techniques) Dellinger effect (radio communications) Dember effect (electrical phenomena) (physics)
For months, President Joe Biden was clear: Despite his constitutional right to pardon people of crimes, he would not issue a pardon for his son Hunter, who was convicted earlier this year for ...
Retail reading. The final monthly retail sales report before the start of the holiday shopping season is set for release on Thursday. Economists estimate retail sales increased 0.3% over the prior ...
LOL! Someone must have attached a battery to this dog because she's not stopping anytime soon. Peppa's zoomies are the epitome of joy, but for those of us watching her, it also looks extremely tiring!