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Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the local atmospheric or ambient pressure.Various units are used to express pressure.he SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m 2 or kgÂ·m â1 Â·s â2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre. Other units of pressure, such as pounds per square inch and bar, are also in common use.
Pressure Units. The SI unit of pressure is the pascal, symbol Pa, the special name given to a pressure of one newton per square metre (N/m 2).The relationships between the pascal and some other pressure units are shown in the table but note that not all are, or can be, expressed exactly.2) The conventional millimetre of mercury (mmHg) and the conventional inch of mercury (inHg) are defined in terms of the pressure generated by a mercury column of unit length and of assigned density 13595.1 kg/m 3 at 0 Â°C under standard gravity of 9.80665 m/s 2.