The fluid which which density is not dependent on pressure :
\rho(T, p) = \rho_0(T) = {\rm const} |
which is equivalent to zero compressibility:
c(T, p) \equiv 0 \Leftrightarrow \frac{d \rho}{ dp} = 0 |
where
Temperature |
It is opposite to Compressible Fluid which density depends on pressure.
Incompressible fluid does not exist but in many practical applications the pressure variation may stay within the sufficiently narrow range where a fluid can be considered as incompressible.
The concept of Incompressible fluid should not be confused with Incompressible flow. The latter can develop even for compressible fluid.
Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Fluid Compressibility
[ Incompressible matter ] [ Incompressible flow ]