  The relativistic equation of state (EOS) of the Van-der-Waals gas is
suggested and analyzed. In contrast to the usual case, the Lorentz contraction
of the sphere's volume is taken into account. It is proven that the suggested
EOS obeys the causality in the limit of high densities, i.e., the value of
sound velocity of such a media is subluminar. The pressure obtained for the
high values of chemical potential has an interesting kinetic interpretation.
The suggested EOS shows that for high densities the most probable configuration
corresponds to the smallest value of the relativistic excluded volume. In other
words, for high densities the configurations with the collinear velocities of
the neighboring hard core particles are the most probable ones. This, perhaps,
may shed light on the coalescence process of any relativistic hard core
constituents.
