Dynamics of a diathermal versus an adiabatic piston in an ideal gas: Langevin's and phase-space approaches
mag(2006)
摘要
We present a comparison between the random motion of an adiabatic and a
diathermal piston sliding in a perfect gas. In particular, their dynamical
behaviour, if investigated by means of Langevin's approach, shows the amplitude
of the adiabatic-piston random displacements around the equilibrium position to
be much larger (by a factor (M/m)^(1/2), where M and m are the piston mass and
the mass of the single gas molecule) than that of the diathermal piston. The
origin of this intriguing difference, which is accounted for in the frame of
Langevin's approach, is also explored in terms of a space-phase analysis.
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关键词
phase space,statistical mechanics,neural network
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