Synonyms: Compressibility factor = Z-factor
Dimensionless multiplier describing the deviation of a fluid density from ideal gas estimate under the same pressure & temperature conditions:
Z = \frac{p \, V_m}{R \, T} = \frac{p}{\rho} \cdot \frac{M}{R \, T} |
where
fluid pressure | fluid molar volume | ||
fluid temperature | fluid volume | ||
fluid density | |||
gas constant | molar mass of a fluid |
Z-factor is related to fluid density as:
\rho(T, p) =\frac{p}{Z(T, p)} \cdot \frac{M}{R \, T} |
Z-factor is related to fluid compressibility as:
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The Z-factor value is trending towards unit value () for incompressible fluids and linear pressure dependence () for strongly compressible Fluids.
Modelling Z-factor as a function of fluid pressure and temperature is based on Equation of State.
There is also a good number of explicit Z-factor Correlations @models.
See also
Natural Science / Physics / Thermodynamics / Equation of State
[ Fluid Compressibility ][ Gas compressibility ]
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