A methodology to define the Cubic Equation of State of a simple fluid

A method to define the Cubic Equation of State (CES) of a simple substance is presented in this work. CES is constructed with only three parameters of the fluid, namely, the critical compressibility Z c ≡ P c v c / R T c , the acentric factor ω ≡ − log (P(sat)/Pc) − 1 (where P(sat) is the saturated vapor pressure), and the saturated vapor volume v ( s a t ) at the temperature T(sat)/Tc = 0.7 (where Tc is the critical temperature, v c is the critical volume, and Pc is the critical pressure). The resulting CES is unique for each substance and, in general, it is different from other known CES in the literature.