To avoid potential ambiguity when referring to pressure in fluid dynamics, many authors use the term static pressure to distinguish it from total pressure and dynamic pressure. Total and dynamic pressure are not pressures in the usual sense – they cannot be measured using an aneroid, Bourdon tube or mercury column. Static pressure + dynamic pressure = total pressure (stagnation pressure) The simplified form of Bernoulli’s equation can be summarized in the following memorable word equation: In incompressible fluid dynamics, dynamic pressure is the quantity defined by: In the high velocity flow through the constriction, kinetic energy (dynamic pressure – ½.ρ.v 2) must increase at the expense of pressure energy (static pressure – p).Īs can be seen, dynamic pressure is dynamic pressure is one of the terms of Bernoulli’s equation. This lowering of pressure in a constriction of a flow path may seem counterintuitive, but seems less so when you consider pressure to be energy density. This effect causes the lowering of fluid pressure (static pressure) in regions where the flow velocity is increased. The term dynamic pressure (sometimes called velocity pressure) is associated with fluid flow and with the Bernoulli’s effect, which is described by the Bernoulli’s equation: In general, pressure is a measure of the force exerted per unit area on the boundaries of a substance.
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