Phase equilibrium Fugacity of the species are the same: fi at T, Psat
For Lewis / RaNdal For low P (ideal case): fiL = Pisat Correction when P > 100 bar
For Henry's Law fiL = fi° = Ha Correction term:
How can we calculate the activity coefficient (γi) of ALL species in a mixture using just one equation?
Excess Property! The difference between the real value of any thermodynamic property (K), and the hypothetical value it would have as an ideal solution at same T, P and composition.