function der_density_pTxi extends TILMedia.BaseClasses.PartialGasObjectFunction; input SI.AbsolutePressure p "Pressure"; input SI.Temperature T "Temperature"; input SI.MassFraction xi[:] "Mass fraction"; input TILMedia.Internals.TILMediaExternalObject gasPointer; input Real der_p "Pressure"; input Real der_T "Temperature"; input Real der_xi[:] "Mass fraction"; output Real der_d "Density"; end der_density_pTxi;