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WETBULB [°C, K, °F, R] returns the wetbulb temperature for air-water gas mixtures. The value and units of the returned value depends on the Unit System setting. This function is applicable only to the substance AirH2O. There are three arguments to this function, in addition to the substance name. One of these arguments must be total pressure (P). The remaining two can be any of the following: temperature (T) or enthalpy (H), relative humidity (R) 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.