It is shown that the irreversible change of any macroscopic variable whose impedance is a rational function of (iw) with a pole at w=0 can be described within the framework of ordinary irreversible thermodynamics. The method of proof is a generalization of that used by Meixner to construct his thermodynamic theory of viscoelasticity: It consists in introducing at first appropriate “inner” variables which obey the ordinary law of irreversible thermodynamics, and afterwards eliminating them.

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