  In this work a first attempt is made to extract the Equation of State (EoS)
using experimental results of the $\phi$ meson produced in nuclear collisions
at AGS, SPS and RHIC energies. The data are confronted to simple thermodynamic
expectations and lattice results. The experimental data indicate a first order
phase transition, with a mixed phase stretching energy density between $\sim$ 1
and 3.2 GeV/$fm^3$.
