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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 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 ...
Neglected firm effect (business analysis) Nernst effect (electrodynamics) (thermodynamics) Network effect (business models) (economics effects) (information technology) (monopoly [economics]) (networks) (transport economics) Non-thermal microwave effect (chemical kinetics)
When it comes to blockbuster weight-loss drugs like Wegovy and Ozempic, opinion among some of President-elect Donald Trump’s top advisers and health policy nominees appears deeply split.
Competition, however, is fierce. Sometimes, there simply aren’t enough pebbles to go around. Biologists have observed Adélie penguins engaging in pebble thievery when times are tough.
Viola Davis received the prestigious Cecil B. DeMille Award at the 2025 Golden Globes but did not get to give a speech during the main telecast.