**Sergey R. Sharov**

30 Vershinina St., apt. 24, Tomsk, 634041 Russia,

E-mail: sharov@post.tomica.ru

*Received: 14 January 2005 / Accepted: 25 April 2005 / Published: 29 April 2005*

**Abstract:**
An ensemble of classical subsystems interacting with surrounding particles has been considered.
In general case, a phase volume of the subsystems ensemble was shown to be a function of time.
The evolutional equations of the ensemble are obtained as well as the simplest solution of these
equations representing the quasi-local distribution with the temperature pattern being assigned.
Unlike the Gibbs's distribution, the energy of interaction with surrounding particles appears
in the distribution function, which make possible both evolution in the equilibrium case and
fluctuations in the non-equilibrium one. The expression for local entropy is obtained.
The derivation of hydrodynamic equations from Boltzmann equation has been analyzed.
The hydrodynamic equations obtained from Boltzmann equation were shown to be equations
for ideal liquid. Reasons for stochastic description in deterministic Hamilton's systems,
conditions of applicability of Poincare's recurrence theorem as well as the problem of
irreversibility have been considered.

**Keywords:**
ensemble of subsystems; phase volume; evolutional equations; quasi-local distributions; irreversibility.

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