Phase diagrams in volume, mole fraction coordinates

For a binary mixture the V,x-diagram with isotherm and isobaric curves cont ains the complete information about the phase behavior of the system. In te rnary mixtures isotherm and isobaric surfaces and additional information on the tie lines describe the complete phase behavior. For a binary mixture the V,x-phase diagrams corresponding to the classified P,T-phase diagrams are shown. The constitute binary, V,x-phase diagrams an d partly the critical V,x-surfaces of the ternary systems are shown for NH3 -Xe-Ar and NH3-C2H4-CH4.