Derivative of humidity ration (absolute) of saturated humid air
function xws_pT_der extends Modelica.Icons.Function; input SI.AbsolutePressure p "Pressure"; input SI.Temperature T "Temperature"; input Real p_der "Derivative of pressure"; input Real T_der "Derivative of temperature"; output Real xws_der "Derivative of absolute humidity ratio"; end xws_pT_der;