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 Zc≡Pcvc/RTcZc≡Pcvc/RTc, the acentric factor ω ≡ − log  (P(sat)/Pc) − 1 (where P(sat) is the saturated vapor pressure), and the saturated vapor volume v(sat)v(sat) at the temperature T(sat)/Tc = 0.7 (where Tc is the critical temperature, vcvc 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.

► A method to build the Cubic Equation of State of a simple substance is presented. ► Inputs are critical compressibility, acentric factor and saturated vapor volume. ► Cubic Equation of State is unique for each substance.