Effects of Pressure Changes on Fluid Properties

The principal effect of a rise in pressure in a compressible fluid, like a gas, is a rise in the density of the fluid. The rise in the pressure of an incompressible fluid will not have an important effect on the density. For illustration, raising the pressure of 100 °F water from 15 psia to 15,000 psia will only raise the density by around 6%. Thus, in engineering computations, it is supposed that incompressible fluids' density stay constant.