partial function isothermalCompressibility_psxi extends TILMedia.BaseClasses.PartialGasObjectFunction; 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 gasPointer; output SI.Compressibility kappa "Isothermal compressibility"; end isothermalCompressibility_psxi;