.ThermalSeparation.Media.IdealGasMixtures.PartialMediumPure.DerDensityByPressure .ThermalSeparation.Media.IdealGasMixtures.PartialMediumPure.DerDensityByPressureType for partial derivative of density with resect to pressure with medium specific attributes
type DerDensityByPressure = SI.DerDensityByPressure;