Gas Compressibility Factor

Written by Jerry Ratzlaff on . Posted in Thermodynamics

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

Gas compressibility factor formula

$$\large{ Z = \frac{p \; V}{n \; R \; T} }$$
Symbol English Metric
$$\large{ Z }$$ = gas compressibility factor $$\large{ dimensionless }$$
$$\large{ n }$$ = number of moles $$\large{ dimensionless }$$
$$\large{ p }$$ = pressure $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$
$$\large{ R }$$ = specific gas constant $$\large{\frac{lbf-ft}{lbm-R}}$$ $$\large{\frac{J}{kg-K}}$$
$$\large{ T }$$ = temperature $$\large{F}$$ $$\large{K}$$
$$\large{ V }$$ = volume $$\large{ft^3}$$ $$\large{m^3}$$