Compressibility Factors Using the Soave-Redlich-Kwong Equation of State

reduced temperature

T

r

1.

The Soave–Redlich–Kwong equation of state can accurately describe a compound in both liquid and vapor phases. This Demonstration applies this equation of state to estimate and plot the compressibility factor,

Z=

PV

RT

, versus reduced pressure,

P

r

=

P

c

, for ethane at various values of the reduced temperature,

T

r

=

T

c

.