Thermodynamic Stability of Medium with an Alternating-Sign Pressure

TL;DR

This paper investigates the thermodynamic stability of a homogeneous medium where one phase has positive pressure and the other negative, challenging traditional classifications and analyzing equilibrium conditions using thermodynamic laws.

Contribution

It introduces a theoretical framework for understanding media with alternating-sign pressure, distinguishing them from mixtures, solutions, or gels.

Findings

Medium with alternating-sign pressure is neither a mixture nor a solution.

Thermodynamic stability conditions are derived for such media.

Thermal radiation and condensate are relevant to these media.

Abstract

The thermodynamic medium is treated as homogeneous phase equilibrium with a special feature: the pressure of one phase is positive and the pressure of the other is negative. From this point of view such medium is neither mixture, usual solution nor gel (or sol as a whole) regardless its components (solvent and dissolved substances). To base this statement the theoretical investigation of the conditions of equilibrium and stability of the medium with sign-alternative pressure is carried out under using the thermodynamic laws and the Gibbs' equilibrium criterion. Thermal radiation and condensate are claimers on the medium with alternating-sign pressure.