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HUMRAT [kg water/kg dry air or lbm water/lbm dry air] returns the humidity ratio for air-water gas mixtures.  The units of the returned value depends on the Unit System setting.  This function is applicable only to the substance AirH2O.  The function requires three arguments which must include pressure and any two remaining independent variables such as temperature (T), relative humidity (R), enthalpy (H), dew point (D), or wetbulb temperature (B).


The letters in parentheses are the identifiers for each property.  A complete list of the identifiers and instructions are available in the Thermophysical Function help.