Abstract

A new technique is proposed to provide a balanced representation of liquid-vapour coexistence densities by means of a cubic equation of state of the van der Waals type, without causing undue deviations in the calculated saturated vapor densities (ρ V ) due to the improvement in the saturated liquid density (ρ L ) calculations. The reduced temperature T r at the condition of ∆Z = Z V -Z L = 0.5 is chosen for preserving the proper location of the dome-shaped saturation curve. This condition represents a value of T r in the vicinity of 0.92 – 0.94. The average absolute deviations in the calculated ρ V and ρ L values for H2, N2, O2, Ar, CH4, and CO2 are about 1%.

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