Maxwell's demon
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Maxwell's demon is an imaginary being invoked in a thought experiment that illustrates the second law of thermodynamics. In the thought experiment there is a gas-filled container with two chambers and a small trap door in the partition between them. The 'demon' opens and closes the door to collect faster moving gas molecules in one chamber and slewer ones in the other chamber, hoping to create a difference in temLink titleperature between the two chambers.