The compressibility factor Z is a dimensionless factor independent of the quantity of gas and determined by the character of the gas, the temperature, and pressure.


Z=\frac{P \cdot V}{n \cdot R \cdot T}= frac{M \cdot P \cdot V}{m \cdot R \cdot T}

where

P= absolute pressure, PSIa / kPa

V= Volume, ft3/ m3

n= moles m/M

m= mass, lb / kg

M Molecular Mass lb/lbmole / kg/kgmole

T temperature, R / K

R= Universal Gas Constant

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