function der_specificIsochoricHeatCapacity_phxi
extends TILMedia.BaseClasses.PartialGasObjectFunction;
input SI.AbsolutePressure p "Pressure";
input SI.SpecificEnthalpy h "Specific enthalpy";
input SI.MassFraction[:] xi "Mass fractions of the first nc-1 components";
input TILMedia.Internals.TILMediaExternalObject gasPointer;
input Real der_p "Pressure";
input Real der_h "Specific enthalpy";
input Real[:] der_xi "Mass fractions of the first nc-1 components";
output Real der_cv "Specific isochoric heat capacity cp";
end der_specificIsochoricHeatCapacity_phxi;