  Due to a rapid change of the entropy density $s(T)$ across the critical
temperature $T_c$ of the QCD phase transition, the pressure $P(T)$ and the
energy density $e(T)$ above $T_c$ generally deviate from their Stefan-Boltzmann
values. We shall demonstrate this both analytically and numerically for a
general class of $s(T)$ consistent with thermodynamical constraints and make a
qualitative comparison of the result with the lattice QCD data. Quantities
related to $ds(T)/dT$ such as the specific heat and sound velocity are also
discussed.
