Fluid pressure

Fluid pressure is the isotropic normal compressive stress in a fluid at rest.

Cavitation is the formation of gas or vapour cavities when a liquid's pressure becomes sufficiently low. A journal bearing model with cavitation must specify how a partly filled film and its boundaries behave, so periodic pressure alone cannot determine the flow there.

The pressure gradient is the vector $\nabla p$ pointing in the direction of fastest pressure increase. The force density exerted by pressure on a continuum is $-\nabla p$.