partial function vapourIsothermalCompressibility_psxi extends TILMedia.BaseClasses.PartialVLEFluidObjectFunction; input SI.AbsolutePressure p "Pressure"; input SI.SpecificEntropy s "Specific entropy"; input SI.MassFraction[:] xi "Mass fractions of the first nc-1 components"; input TILMedia.Internals.TILMediaExternalObject vleFluidPointer; output SI.Compressibility kappa_v "Isothermal compressibility of vapour phase"; end vapourIsothermalCompressibility_psxi;