@wikipedia


Fluid Compressibility is a function of temperature and pressure:

c = c(T, p)


The multi-phase compressibility is a linear sum of compressibilities of its phases.

Approximations


Incompressible fluid

c(p) = 0


Slightly compressible fluid

c(p) = \rm const

Ideal gas 

c(p) = \frac{1}{p}


Wide range compressibility proxy model

c(p) = \frac{c_0}{1+c_0 \cdot p}


See also


Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Statics / Fluid Compressibility

[Compressibility] [Multi-phase compressibility]