Maxwell's demon

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Max·well's demon

 (măks′wĕlz′, -wəlz)
n.
An imaginary creature who is able to sort hot molecules from cold molecules without expending energy, thus bringing about a general decrease in entropy and violating the second law of thermodynamics.

[After James Clerk Maxwell.]
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Noun1.Maxwell's demon - 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 holeMaxwell's demon - 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
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Among his topics are mass in motion, from statistical entropy to statistical time, using quantum mechanics to resolve the Maxwell demon paradox, from Wigner's friend to quantum eraser, and quantum mechanics and the big questions.
In fact, RNA polymerase is so far the best-established example of a biological Maxwell demon, says Steven Block, a biophysicist at Stanford University.
Jonathan Rhys Meyers plays Brian Slade - a very transparent take on David Bowie - who, at the peak of his fame and on the last night of an international tour as alter-ego Maxwell Demon, pretends to be assassinated.