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Synonyms
Compressibility factorZ-factor

Disclaimer: Not to be confused with Compressibility 

LaTeX Math Inline
bodyc
.

Dimensionless multiplier describing the deviation of a fluid density from ideal gas estimate under the same pressure & temperature conditions:

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LaTeX Math Inline
bodyp

fluidpressure

LaTeX Math Inline
bodyV_m = V/\nu

fluid molar volume

LaTeX Math Inline
bodyT

fluidtemperature

LaTeX Math Inline
bodyV

fluidvolume

LaTeX Math Inline
body\rho

fluid density

LaTeX Math Inline
body\nu

amount of substance

LaTeX Math Inline
bodyR

gas constant

LaTeX Math Inline
bodyM

molar mass of a fluid

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Z-factor is related to fluid density 

LaTeX Math Inline
body\rho
 and Formation Volume Factor (FVF) 
LaTeX Math Inline
bodyB
as:

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