Kammerlingh-Onnes proposed the virial equation of state shown in Equation 7. 19 20 And B, C, …are not constants but functions of temperature called the second, third,…virial coefficients.

A new cubic molecular-based equation of state (MMM) accurately calculates pressure, volume, temperature (PVT) and vapor-liquid equilibrium (VLE) data for pure and mixed fluids. A new cubic ...