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(see Compressibility @ Wikipedia)

A measure of fluid density 

LaTeX Math Inline
body\rho_f
change due to pressure 
LaTeX Math Inline
bodyp
variation:

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c_f = \frac{1}{\rho_f} \frac{\partial \rho_f}{\partial p}


This can be redefined in terms of fluid volume

LaTeX Math Inline
bodyV_f
:

LaTeX Math Block
anchorS38Q3
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c_f = -\frac{1}{V_f} \frac{\partial V_f}{\partial p}