In the Ideal Thermodynamic example, the liquid phase is ideal, with activity coefficients of unity. The system is intended to be used for T < Tcrit,i for all compounds, so that all vapor pressures are finite and positive. Calculations that violate this constraint result an error.

Poynting correction and saturated fugacity coefficients are ignored, so that the liquid phase fugacity is given by

1st equation Liquid Phase props Ideal Thermo example

where the saturated vapor pressure only depends on temperature. The liquid phase enthalpy follows from:

2nd equation Liquid Phase Properties In Ideal Thermo example

The liquid phase entropy follows from:

3rd equation Liquid Phase props Idela Thermo example

The liquid phase volume is ideal:

4th equation Liquid Phase props Ideal Thermo example

and the liquid phase density follows from ρL = 1/vL.