Block to compute the humidity ratio for a given water vapor partial pressure.
If use_p_in is false (default option), the p parameter
is used as atmospheric pressure,
and the p_in input connector is disabled;
if use_p_in is true, then the p parameter is ignored,
and the value provided by the input connector is used instead.
p_w.
HumidityRatio_pWat to X_pW.
RealInput are obsolete in Modelica 3.0.