  A brief review of the Hadron Gas model with reference to high energy heavy
ion collisions is presented. The entropy dependence on temperature and baryonic
chemical potential is numerically calculated, together with the entropy
distribution between baryons and mesons. The theoretical entropy for a QGP with
equivalent parameters is also calculated. It is shown that at low temperatures
the dominant entropy contribution comes from baryons, while at high energies
the dominant contribution comes from mesons. The turnover from baryon to meson
domination occurs at T approx 140 MeV, which corresponds to an energy domain of
the AGS at Brookhaven National Laboratory.
