** 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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