The existing “quotidian equation state” model, based on
Thomas-Fermi theory, is modified so as to improve the low density region
of phase diagram of metals. A scheme for estimating the critical
parameters of liquid-vapor phase transition is proposed. The new model
reproduces experimental critical isotherms to a good degree of accuracy.
Furthermore, the proposed model is validated with thermodynamic data in
the liquid-vapor co-existence region, including results on isobaric
expansion as well as released isentropes.
