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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:

LaTeX Math Block
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)
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\betaK = \rho \left( \frac{\partial p}{\partial \rho} \right) = - V_m \left( \frac{\partial p}{\partial V_m} \right)

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It measures its resistance of Continuum body  to compression/decompression.

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