Static Pressure

Static pressure, abbreviated as SP, (English units \(\large{\frac{ft^3}{min}}\), Metric units \(\large{\frac{m^3}{min}}\)), is a fundamental concept in fluid dynamics that refers to the pressure exerted by a fluid at a specific point in a flow without considering its motion or velocity.  It represents the pressure energy associated with the fluid's molecular collisions and is independent of the fluid's velocity.  The static pressure at a point in a fluid flow is a measure of the fluid's thermodynamic or potential energy.  It is the pressure that would be exerted on a surface if it were at rest or stationary in the fluid flow.  Static pressure is typically measured using devices such as pressure gauges or manometers.

In a fluid at rest, the static pressure is the same at all points, assuming the fluid is incompressible and the gravitational effects are negligible.  However, in a fluid in motion, the static pressure can vary from point to point due to changes in the fluid's elevation or the presence of obstructions.

Static pressure is an important parameter in various engineering applications.  In aerodynamics, it is used to calculate lift and drag forces on objects moving through a fluid, such as aircraft wings.  In fluid flow analysis, it is utilized in pressure distribution calculations, pipe flow calculations, and pressure drop calculations in pipes, channels, and other conduits.