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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.

A number of local potentials which provide good fits to the 1S0phase shifts of MacGregor, Arndt and Wright for pp and np scattering are described. Their relation to Bargmann potentials is exhibited. The off-energy-shell properties of these potentials are studied in relation to a number of well-known potentials. The implications of the existence of soft local potentials for several nuclear problems are discussed.