Molecular weight of air at standard conditions, [g/mol].
=PO.PVT.Ma.Air.Stn()
Calculates gas specific gravity from molecular weight, [dimensionless].
Calculates gas compressibility, [1/psi].
Calculates gas density, [g/cc].
Converts API gravity to oil specific gravity, [dimensionless].
Calculates gas compressibility factor (Z) using Brill and Beggs (1974) correlation, [dimensionless].
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