 Redlich–Kwong equation of state

The Redlich-Kwong equation of state is a thermodynamic model used to describe the behavior of fluids, particularly gases and vapors, over a range of temperatures and pressures. It is an improvement over the ideal gas law, taking into account the interactions between particles and the volume occupied by them. The equation is given by: \[ P = \frac{RT}{V_m - b} - \frac{a}{T^{0.