© Dr. Steve Rapp, 2005

Real Gases

The Van der Waals Equation

The Van der Waals Equation

V -
na

Z
= V- nb RTV

©

©See table 11.4 for Van der Waals constants

Engineers
must sometimes use high-pressure gases where the perfect
gas equation no longer applies. The Z factor
must be introduced into the equation.

PV = ZnRT