Maxwell’s demon experiment could be made real without breaking physics

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A thought experiment called Maxwell’s demon, long hypothesised to break the laws of physics, could be made using simple electronic devices at macroscopic scales – without upsetting the laws of thermodynamics



Physics



10 May 2022

Illustration of a computer motherboard with microchips, transistors and semiconductors.

An illustration of a computer motherboard with transistors

EDUARD MUZHEVSKYI / SCIENCE PHOTO LIBRARY

A 155-year-old thought experiment about the laws of thermodynamics could help shed light on how biological cells process fluctuations in their environments.

Maxwell’s demon is a thought experiment first proposed by Scottish mathematician James Clerk Maxwell in 1867. He imagined a tiny demon controlling a gate between two chambers full of gas. The demon then opens the door to allow fast-moving gas particles into one chamber and slow-moving ones into the other. Because the speed of the constituent particles determines a gas’s …



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