The ambiguous meaning of irreversibility

Details The ambiguous meaning of irreversibility The ambiguous meaning of irreversibility

1995-02-06

arxiv.org/abs/chao-dyn/9502004v2

Reprinted from J. Tech. Phys. (Poland) 38 (1997) 231-234

Nonlinear Sciences

Chaotic Dynamics

Latex, 4 pages

Scientific paper

Irreversibility of spontaneous macroscopic dynamics and its asymmetry with respect to the sign reversal of the variable $t$ is usually interpreted as a genuine property of complex isolated systems. Discussion of the kinetics involved in Joule's experiment concerning spontaneous expansion of a gas shows that the isolation hypothesis results from ambiguous definitions of a number of keywords. Whereas Poincar\'{e}'s apparent irreversibility result from conservative Hamiltonian dynamics, full relaxation implies interaction with the outside world. Only the latter process leads to entropy change.

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