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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.
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 ...
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?
1 Science Experiment. 11 comments. 2 Science Experiment. ... Toggle the table of contents. Talk: Mpemba effect/Archives/ 2.
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Moons, too, have a significant effect on a person's zodiac sign (which is why horoscopes are always changing due to the various lunation that cycle each month). Full moons, specifically, bring ...
In statistics, specifically the analysis of data in the design of experiments, a DOE mean plot is a graphical tool used to analyze data from an experiment. In it, it demonstrates the relative importance of all the factors in an experiment with respect to a chosen location statistic, in this case the mean. Each factor is plotted and all mean ...