  Features and parameters of \boiling" liquid layer, which arises under
conditions of isentropic expansion of warm dense matter (WDM), are stud- ied
with the use of simplest van der Waals equation of state (EOS). Advan- tage of
this EOS is possibility of demonstrable and semi-analytical descrip- tion of
thermo- and hydrodynamics of the process. Idealized self-similar case of
behavior of matter on interception of equilibrium (not metastable) isoentropic
curve and boundary of gas-liquid coexistence curve (binodal) is analyzed. The
possibility of formation of such "liquid layer" was studied previously in [1]
during solving the problem of ablation of metal surface under the action of
strong laser radiation. Peculiarity of such "freezing" of finite portion of
expanding matter in the state, which corresponds to the binodal of gas-liquid
or/and other phase transitions|so called "phase freezeout"and prospects of
applications of this phenomenon for intended generation of uniform and
extensive zone of previously unexplored states of matter were discussed in [2].
