The fluid which which density is dependent on pressure $\begin{array}{l}p\end{array}$ :

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

which is equivalent to non-zero compressibility:

(2)	$\begin{array}{l}\displaystyle c(T, p) = \frac{1}{\rho} \frac{d \rho}{ dp} \neq 0\end{array}$

where

$\begin{array}{l}T\end{array}$

It is opposite to Incompressible fluid which density does not depend on pressure.

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