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In the present paper, we describe an approach to thermodynamics that does not involve Bogolyubov chains or Gibbs ensembles. We present isotherms, isochores, and isobars of various pure gases, as well as binodals, i.e., lines along which gas becomes liquid, and spinodals (endpoints of isotherms). We study supercritical phenomena for values of temperature and pressure above the critical ones. A lot...
In the paper by E. M. Apfelbaum and V. S. Vorobiev [1], it was shown that the critical isotherms of real pure gases coincide with the corresponding isotherms of the classical distribution of Bose-Einstein type for fractional dimension (fractional number of degrees of freedom). For isotherms with T < Tc, this coincidence no longer occurs, and for some gases the discrepancy is considerable. In...
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