Ideal Gas / Van der Waals Equation

Description

Precision:

Parameter	Symbol	Value
Gas constant (J kg^-1 K^-1)	R
Van der Waals constant (Pa m⁶ kg^-2)	a
Van der Waals constant (m³ kg^-1)	b
Pressure (Pa)	P
Density (kg m^-3)	ρ
Temperature (K)	T

Set any two of P, ρ, T and calculate the third.
Set a = 0 and b = 0 for the Ideal Gas Equation.