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Maxwell demon

Maxwell demon

noun Physics.
a hypothetical agent or device of arbitrarily small mass that is considered to admit or block selectively the passage of individual molecules from one compartment to another according to their speed, constituting a violation of the second law of thermodynamics.

Origin:
1875–80; after J. C. Maxwell
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Maxwell demon is always a great word to know.
So is fluidity. Does it mean:
the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum
the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity
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