The phase structure of hadrons and quark-gluon plasma is investigated by two
types of equation of hadron state, namely ideal hadron gas model and the
compressible bag model. It is pointed out that, while the ideal gas model
produces unrealistic extra hadron phase, the compressible bag model gives an
expected and reasonable phase diagram even if rich hadron spectrum is taken
into account.Comment: 14 pages, 11 figures, LaTeX2