Fluid Pressure and Speed Changes

Bernoulli's equation links fluid pressure and fluid speed in a static, incompressible fluid. For horizontal flow, where gravitational energy density stays constant, the equation is especially useful. In that setting, the result is known as Bernoulli's principle.

Bernoulli's principle says that fl...

Bernoulli's equation applies to any incompressible fluid in a laminar, steady flow. A static fluid has zero kinetic energy density. Thus, Bernoulli's equation applied to a static, incompressible fluid reduces to an expression relating the pressures at different heights.

If a fluid moves horizontally, the gravitational energy density is co...