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Compressibility depends on the thermodynamic conditions at which it is measured and as such is not a material property.
The most popular material compressibilities aretwo major medium compaction process are isothermal and isentropic which result in different values of compressibility:
| Isothermal Compressibility | Isentropic Compressibility |
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| LaTeX Math Block |
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| c_T = \frac{1}{\rho} \left( \frac{\partial \rho}{\partial p} \right)_T |
| | LaTeX Math Block |
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| c_S = \frac{1}{\rho} \left( \frac{\partial \rho}{\partial p} \right)_S |
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Compressibility is related to Z-factor and Formation Volume Factor (FVF)
as:| LaTeX Math Block |
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| c(p) = \frac{1}{p} - \frac{1}{Z} \frac{dZ}{dp} |
| | LaTeX Math Block |
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| c(p) = - \frac{1}{B} \frac{dB}{dp} |
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See also
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Physics / Mechanics / Continuum mechanics / / Continuum body
[Fluid compressibility] [Pore compressibility] [Total compressibility]
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