02-08U

It is well-known that in the hydrodynamic region (small $k$ and $\omega $) liquids and liquid mixtures are well described by the linearized hydrodynamic equations. This paper is aimed on the problem of behaviour of the binary liquid mixture which leaves hydrodynamic region, when non-conserved parameters, are included to the basic set of dynamic variables of the system. Namely, the basic set of variables which includes densities of partial energies of both subsystems is being investigated. It is shown that there exist two heat modes, one of which is hydrodynamic one and describes thermal diffusion in the system, and the second mode is kinetic one and describes the process of temperature equilibration between subsystems. In the hydrodynamic limit the contribution of the second mode is negligible.