Gauge pressure

Gauge pressure is a measure of pressure relative to the ambient atmospheric pressure. It is often used in various fields such as physics, engineering, and medicine to measure the pressure of a system.

Definition

Gauge pressure is defined as the pressure in a system relative to the atmospheric pressure. It is calculated by subtracting the atmospheric pressure from the absolute pressure of the system. The unit of gauge pressure is the Pascal (Pa), although it is often expressed in other units such as pounds per square inch (psi) or bar.

Measurement

Gauge pressure is typically measured using a pressure gauge. These devices can be mechanical, using a Bourdon tube, diaphragm, or piston to measure pressure, or they can be electronic, using a pressure transducer to convert pressure into an electrical signal.

Applications

Gauge pressure is used in a wide variety of applications. In engineering, it is used to measure the pressure in hydraulic systems, pneumatic systems, and HVAC systems. In medicine, it is used to measure blood pressure and intraocular pressure. In meteorology, it is used to measure atmospheric pressure.

See also

• Absolute pressure
• Atmospheric pressure
• Pressure measurement

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