Dear Dr. Steffan, Thanks, I did it. I found Energy (Ryd/atom) for different volume (bohr^3/atom) from EOS. then by using data within case.eosfitb i calculated H=E+PV.
I converted the unit of Energy to Jules and Pressure to (Pa=N/m^2) and volume to (meter^3) till the unit of H be Jules. after that i plotted The Curve of H vs. Pressure for two phases but i found many Pressure which in it two enthalpy curves intersect. It will be so useful if you guide me. With best, Mahdi
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