Report No. 8, AGA, Compressibility Factors of Natural Gas and Other Related Hydrocarbon Gases, 1992. GPA 2172 (API MPMS 14.5), Calculation of Gross Heating Value, ...

The compressibility factor (z-factor) quantifies the deviation of natural gas from ideal gas behaviour under varying pressures, temperatures, and compositions.

Real Gases Real gases. Compressibility Factor. Van der Waals Equation. Condensation of gases. Principle of Corresponding States. Math Interlude Partial Differentiation. Thermodynamics First Law.

Two separate correlations for predicting the isothermal compressibility of reservoir fluids and crude oils have been developed. One correlation is based on molecular weight; the other, on API ...