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The compressibility factor (Z), also known as the compression factor or the gas deviation factor, is a correction factor which describes the deviation of a real gas from ideal gas behavior behavior. The value calculated for Z should not be greater than zero. The compressed factor has no units of measure. The calculations below can be used to find the inlet or the outlet compression factor by using the values for temperature and pressure in units of °R and psia. The Redlich–Kwong equation of state relates temperature, pressure, volume and volume of gases.