Entropy Decrease in Isolated Systems with an Internal Wall undergoing Brownian Motion

2); (2) University of L'Aquila; B. Crosignani (1; INFM); P. Di Porto (2) ((1) California Institute of Technology

arxiv: physics/9907011 · v1 · submitted 1999-07-06 · ⚛️ physics.class-ph

Entropy Decrease in Isolated Systems with an Internal Wall undergoing Brownian Motion

B. Crosignani (1 , 2) , P. Di Porto (2) ((1) California Institute of Technology , (2) University of L'Aquila , INFM) This is my paper

classification ⚛️ physics.class-ph

keywords motionsystembrowniandecreaseentropyh-theoreminternalisolated

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We consider an isolated gaseous system, divided in two parts by an adiabatic movable frictionless internal wall undergoing Brownian motion. We show how this kind of motion can lead to a substantial decrease of the system entropy. This surprising result does not violate Boltzmann's H-theorem since the molecular chaos assumption underlying H-theorem is not fulfilled by our system.

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Entropy Decrease in Isolated Systems with an Internal Wall undergoing Brownian Motion

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