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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.
A force applied to surface with an area A will have will result in a pressure P as defined above. Force has the units mass length/time^2 and area has the units length^2. Inserting this into the equation above results in the units of pressure as. A pascal is the SI unit of pressure.Consider gas molecules in a rectangular box. Every time a molecule collides with a wall of the box the collision results in a force on the box. These forces combine and result in the pressure of the gas. Units of Pressure. As shown above the SI unit of pressure is the pascal (Pa).hese forces combine and result in the pressure of the gas. Units of Pressure As shown above the SI unit of pressure is the pascal (Pa). However, the pascal is not the most convenient unit of pressure. The table below lists some more common units of pressure.