Gas compressibility factor

Standing and Katz gas compressibility factor

gas compressibility factor is the ratio of the Real Gas volume to the Ideal Gas volume, which is a measure of the amount that the gas deviates from the perfect behavior.

$z = \frac{Actual\ volume\ of\ gas\ at\ specified\ T\ and\ P}{Ideal\ volume\ of\ gas\ at\ same\ T\ and\ P}$

Z factor in the PVT software at pengtools.com

Discussion

Dranchuk correlation is the default correlation for the gas compressibility factor in the PVT tool.

Nomenclature

$P$ = Pressure, psia

$T$ = Temperature, °R

$z$ = Gas compressibility factor, dimensionless

See also

Ideal Gas
Real Gas
gas compressibility factor
EOS