  Based on the fundamental Bogolyubov chain of equations, a model relating the
structural and thermophysical properties of the nonequilibrium liquid systems
under irradiation in stationary state is introduced. The obtained results
suggest that the thermophysical properties of the liquid systems under
irradiation are defined by the {\textquotedblleft}effective
temperature{\textquotedblright} that can be calculated from the perturbed
momentum distribution functions of the systems. It is shown that the structural
changes in the liquid systems under irradiation are caused by the changes in
the coefficients of the Maxwell distribution function due to the momentum
exchange between the active particles and the particles forming the liquid. To
confirm the theoretical predictions, a qualitative comparison of the model with
the existing experimental data on irradiation influence on the surface tension
coefficients of liquids is performed.
