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Disclaimer: Not to be confused with Compressibility factor 

LaTeX Math Inline
bodyZ
.


A measure of resistance of a Continuum body to compression/decompression.A measure of relative change in density 

LaTeX Math Inline
body\rho
 or  molar volume  
LaTeX Math Inline
bodyV_m
 under a unit 
pressure 
LaTeX Math Inline
bodyp
 variation:

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SymbolDimensionSI unitsOil metric unitsOil field units

LaTeX Math Inline
body\beta
 or 
LaTeX Math Inline
bodyc

M-1 L1 T2Pa-1kPa-1

psi-1


Compressibility measures resistance of Continuum body to compression/decompression and is inverse to Bulk modulus 

LaTeX Math Inline
bodyK
:

LaTeX Math Block
anchorK
alignmentleft
c = \frac{1}{K}


Compressibility depends on the thermodynamic conditions at which it is measured and as such is not a material property.

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Both 

LaTeX Math Inline
body\beta_T
 and 
LaTeX Math Inline
body\beta_S
 are not dependent on the amount of chemical substance and defined under a clear under specific conditions of thermodynamic process and 
as such are the material properties and properly tabulated for the vast majority of materials.

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[Fluid compressibility] [Pore compressibility] [Total compressibility]

Bulk modulus (K or B)]