maxwell's demon

Noun
  1. An imaginary creature that controls a small hole in a partition that divides a chamber filled with gas into two parts and allows fast molecules to move in one direction and slow molecules to move in the other direction through the hole;
    This would result in one part of the container becoming warmer and the other cooler, thus decreasing entropy and violating the second law of thermodynamics (synset 109512276)

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