Compressibility (single-phase fluid)

A measure of relative fluid density $\begin{array}{l}\rho_f\end{array}$ change due to a unit pressure $\begin{array}{l}p\end{array}$ variation:

(1)	$\begin{array}{l}\displaystyle c_f = \frac{1}{\rho_f} \frac{\partial \rho_f}{\partial p}\end{array}$

This can be redefined in terms of fluid volume $\begin{array}{l}V_f\end{array}$ :

(2)	$\begin{array}{l}\displaystyle c_f = -\frac{1}{V_f} \frac{\partial V_f}{\partial p}\end{array}$

Symbol	Dimension	SI units	Oil metric units	Oil field units
$\begin{array}{l}c_f\end{array}$	M^-1 L¹T²	Pa^-1	kPa^-1	psi^-1

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