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QUALITY [dimensionless] returns the quality (vapor mass fraction) for substances modeled as real fluids such as Water and R12.  Two independent arguments are required.  Temperature and pressure are not independent for saturated states.  If the state of the substance is found to be subcooled, the quality is returned as -100.  If it is superheated, 100 is returned.


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