The ambiguous meaning of irreversibility
نویسنده
چکیده
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 Poincaré'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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