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The Viscosity function returns the viscosity of the specified substance in kg/s-m (or N-s/m2) in SI units and in lbm/ft-hr in English units.   SI or English system is chosen in the Unit System dialog. 


For ideal gas and incompressible substances, the Viscosity function takes one parameter in addition to the fluid name and this parameter must be temperature.  For AirH2O (moist air), the temperature, pressure, and humidity ratio (or relative humidity) must be supplied as arguments.  For real fluids, the Viscosity function takes two parameters.  Any two independent properties can be supplied, provided that the state does not consist of two phases. 


The list of property identifiers needed in the calling arguments and instructions are available in the Thermophysical Function help.