What is incompressible fluid?

Incompressible - same as water.

Liquids or incompressible fluids that is their volume do not change when the presure changes.

Which word do you not understand? incompressible - cannot be compressedviscous - resistant to flow, "thick"fluid - substance that flows (both gases and liquids are fluids, but gases are usually...

let \rho is density of phase fluid and v is velocity of phase fluid (velocity in a phase space!!) we take the equation of continuity (we suppose "mass" of phase fluid is conserved) and using Hamilton...

For all conventional intents and purposes, liquid water is incompressible.