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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.
It is widely used in the daily life particularly in European countries, though that is a non-SI unit. 1 bar is equal to 100,000 Pascals, which is close approximately to atmospheric pressure, so it is often used to represent atmospheric pressure rather than standard atmosphere (101325 Pascals). Kilonewton/Square Meter. The kilonewton per square meter (kN/m2) is a non-SI unit for pressure. 1 kN/m2 equals 1,000 N/m2. Pressure is defined as force per area and the SI unit for force is Newtons(N) and the SI unit for area is square meters(m2). 1 Newton per square meter equals 1 Pascal, therefore, 1 kN/m2 =1000 Pa.