Fluid Compressibility is a function of temperature and pressure:

(1)	$\begin{array}{l}\displaystyle c = c(T, p)\end{array}$

Approximations

Incompressible fluid

Slightly compressible fluid

Ideal gas

Wide range proxy

(2)	$\begin{array}{l}\displaystyle c(p) = 0\end{array}$

(3)	$\begin{array}{l}\displaystyle c(p) = c_0 = \rm const\end{array}$

(4)	$\begin{array}{l}\displaystyle c(p) = \frac{1}{p}\end{array}$

(5)	$\begin{array}{l}\displaystyle c(p) = \frac{c_0}{1+c_0 \cdot p}\end{array}$

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