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PRESSURE [Pa, kPa, bar, MPa, psia, atm] returns the pressure of a specified substance. The value and units of the returned value depends on the Unit System setting. The argument list for the pressure function always requires the substance name followed by two arguments, each item separated by commas. The pressure function is not implemented for AirH2O; however, an unknown pressure can still be determined using any of the functions that are applicable to moist air and which take pressure as an argument.
The list of property identifiers needed in the calling arguments and instructions are available in the Thermophysical Function help.