<Li> p is the total fluid pressure . </Li> <Li> p is the static pressure, which strictly depends on depth . </Li> <Li> p is the fluid pressure caused by fluid motion . </Li> <P> Since water is an incompressible fluid, the dynamic pressure component of the total pressure can be expressed in terms of the water density and the water velocity as is shown in Equation 2 . </P>

Speed of a submarine can be measured by pirani gauge