This information is part of the Modelica Standard Library maintained by the Modelica Association.

Relative humidity is computed from pressure, temperature and composition with 1.0 as the upper limit at saturation. Water mass fraction is the first entry in the composition vector.

phi = relativeHumidity_pTX(p, T, X)

p	Type: Pressure (Pa) Description: Pressure
T	Type: Temperature (K) Description: Temperature
X	Type: MassFraction[:] Description: Composition

phi	Type: Real Description: Relative humidity