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RELHUM [dimensionless] returns the relative humidity as a fractional number for air-water gas mixtures.  This function is only applicable for fluid AirH2O.  There are three arguments to this function, in addition to the substance name, AirH2O.  One of these arguments must be total pressure (P).  The remaining two can be any of the following: temperature (T) or enthalpy (H),  wet bulb (B) or humidity ratio (W) or dewpoint (D).


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.