Name: The Mpemba Effect Explained
Uploaded: 2026-01-08T01:02:30.443Z
Description: Learn why hot water freezes faster than cold water and the science behind the Mpemba effect. We look at evaporation, convection, and supercooling.

Learn why hot water freezes faster than cold water and the science behind the Mpemba effect. We look at evaporation, convection, and supercooling.

## Why hot water freezes faster than cold water The idea that hot water freezes faster than cold water seems to break the laws of physics. Most people assume cold water has a head start, but the Mpemba Effect suggests otherwise. This phenomenon was brought to modern attention in 1963 by a student named Erasto Mpemba, who noticed his hot ice cream mix froze before the cold batches. While it sounds impossible, there are several scientific theories that attempt to explain why this happens. Science suggests that a few things might be happening at once. Evaporation plays a role because hot water loses mass through steam, leaving less liquid behind to freeze. Temperature differences also create stronger convection currents, which help move heat away from the center of the container more efficiently. Additionally, cold water often experiences supercooling, where it stays liquid even below zero degrees, whereas hot water tends to skip this delay. * The history of Erasto Mpemba and his ice cream experiment.
* How evaporation reduces the amount of water that needs to freeze.
* The role of convection currents in spreading cold throughout the liquid.
* Why cold water gets stuck in a liquid state known as supercooling. Even after sixty years of research, physicists still haven't reached a unanimous conclusion on the primary cause. It remains one of the most interesting mysteries in thermodynamics.

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