@wikipedia
Disclaimer: Not to be confused with Compressibility factor .
A measure of resistance of a Continuum body to compression/decompression.
A measure of relative change in density
or molar volume under a unit pressure variation:| LaTeX Math Block |
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\beta = \frac{1}{\rho} \left( \frac{\partial \rho}{\partial p} \right) = - \frac{1}{V_m} \left( \frac{\partial V_m}{\partial p} \right) |
Compressibility depends on the thermodynamic conditions at which it is measured and as such is not a material property.
The two major medium compression/decompression processes are isothermal and isentropic which result in different values of compressibility:
Both and are not dependent on the amount of chemical substance and defined under a clear conditions of thermodynamic process and as such are the material properties and properly tabulated for the vast majority of materials.
In engineering practise, when the term Compressibility is used as material property it normally means Isothermal Compressibility: .
Compressibility is related to Z-factor and Formation Volume Factor (FVF)
as:| LaTeX Math Block |
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| \beta(p) = \frac{1}{p} - \frac{1}{Z} \frac{dZ}{dp} |
| | LaTeX Math Block |
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| \beta(p) = - \frac{1}{B} \frac{dB}{dp} |
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See also
Physics / Mechanics / Continuum mechanics / Continuum body
[ Isothermal Compressibility ][ Isentropic Compressibility ]
[Fluid compressibility] [Pore compressibility] [Total compressibility]
[ Bulk modulus (K or B)]
