Real Gas

Brief

Real Gas is a gas whose molecules occupy space and have interactions [1].

Real Gas deviates from Ideal Gas by proportionality term z, which is gas compressibility factor.

Equation Of State

The Real Gas EOS:

$PV = zn RT = z\frac{m}{M} RT$

Nomenclature

$m$ = mass, lb_m

$M$ = molecular weight, lb_m/lb_mol

$n$ = number of moles, lb_mol

$P$ = Pressure, psia

$R$ = universal gas constant, 10.7316 psia ft³/ lb_mol/ °R

$T$ = temperature, °R

$V$ = volume, ft³

$z$ = gas compressibility factor, dimensionless