Time asymmetry in a dynamical model of the one-dimensional ideal gas
摘要：
We present a simple dynamical model of the one-dimensional ideal gas and show how it can be used
to introduce a number of fundamental ideas in statistical mechanics. We use the model to illustrate
the role of initial conditions in explaining time asymmetry and show that although the dynamical
model is time-reversal invariant, the macroscopic behavior of the gas can be time-asymmetric if the
initial conditions are chosen properly.

A. D. Boozer，Am. J. Phys., Vol. 76, No. 11, November 2008