Abstract
Abstract The problem of the choice of the independent internal thermodynamic parameters for the description of nonequilibrium systems is discussed on the basis of Bogolubov's idea concerning the relaxation time hierarchy as well as successive reductions in the description of nonequilibrium states of the system when it tends to equilibrium. The set of parameters is shown to be specified, in principle, by the explicit form of the hamiltonian of the system. General conclusions are used to analyse a number of difficulties in the phenomenological theory of magnetic relaxation in solids. Special attention is paid to a good choice of macroscopic parameters. The problem concerning the question why in some cases the application of Bloch equations is incorrect is discussed.
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