On a Theorem of Irreversible Thermodynamics. II

Abstract

The fluctuation-dissipation theorem, which relates the equilibrium fluctuations to the admittance of a thermodynamic linear dissipative system, is generalized for more than a single extensive parameter. The real part of the admittance is shown to be symmetric, supplying thereby an extension of the reciprocity theorem of Onsager. The analysis is macroscopic and thermodynamic in nature, and is carried out for adiabatic constraints as well as for microcanonical constraints.