Abstract: By analysis of recently commonly used equations of state_, . a ne,w，equ-
ati.,on of stateis presented in this paper,_ Gas . compressibility and- liquid
density of pure components such as CH₄ to C₁₆H₃₄, and, N₂.CO₂，as-well
as compressibibility of hydrocarbon mixtures, for instance, the gas sample
of wen-72 well in Central China Oilfield, are calculated by this new eq-
uation, It -is shown that the equation can be used to predict volumetric
properties of a system more accurately than the others with. awi.der - range
of temperature and pressure.

Key words: volumetric characteristic, state, equat-ion, calculations, data