Pressure, Atmospheric, Gauge, Vacuum Pressure

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Pressure: It is defined as the magnitude of force acting normally per unit area of the surface of body. SI unit of pressure is N/m² and is called Pascal (Pa).


Atmospheric pressure : The atmospheric pressure at any point is numerically equal to the weight of a column of air of unit cross-sectional area extending from that point to the top of atmosphere.

Gauge pressure and Vacuum pressure : When the unknown pressure is higher than the atmospheric pressure, the pressure recorded by the instrument is called gauge pressure while a pressure recorded below the atmospheric pressure is known as vacuum pressure.

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