Definitions of Pressure

pressure

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Pressure - Normal force per unit area exerted by a fluid on a containing wall with respect to a reference.

Absolute Pressure - Normal force per unit with respect to zero absolute pressure.

Ambient pressure - The pressure at which a device operate.

Gauge pressure - pressure above or below ambient pressure.

Differential pressure - difference in pressure between any two points in a system.

Total pressure - pressure on a plane normal to the local flow direction

Static pressure - pressure on a plane perpendicular to the local flow direction.

Velocity pressure - net effect of the difference between total pressure and static pressure.