Isothermal Compressibility

In this spreadsheet, just type in the required information and press the compute button. Scroll down for more info.

Pressure
psia
Temp
deg R
Ppc*
psia
Tpc*
deg R
Mol.*
Weight
CO2
fraction
H2S
fraction
Delta P**
(psi)
Gas Type
Cg
1/psi
* Note 1: (Ppc, Tpc) and Mol. Weight are mutually exclusive. Enter 0 for the ones you don't need.
** Note 2: A small change, say 10 psi


Gas Coefficient of Isothermal Compressibility
Cg = 1/p - 1/z *(Delta z/Delta p)
Where
Cg = Coefficient of isothermal compressibility, 1/psi,
p = pressure of interest, psia,
z = gas Z factor at p,
Delta p = a small change of p, psia,
Delta z = change of z corresponding to Delta p. This change is calculated according to Z Factor


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