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State the various units of atmospheric pressure |
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Answer» Atmospheric pressure is expressed in quite a number of units.1) Atmosphere (atm) : Naturally the easiest. Ambient pressure = 1 atm.2) Bar : Popular, yet non-SI unit. 1 atm = 1.01325 bar (source: google!)3) Pascal : The SI unit of pressure, but not very popular in Earth sciences. 1 atm = 101.325 KPa (no wonder it’s unpopular)4) Torr : Manometric unit of pressure (mm column of Hg). Quite old. Almost no significance today. 1 atm = 760 Torr5) psi (pounds-per-square-inch): Also informal. Prevalent form of pressure measurement. However, not very popular in Earth sciences or meteorology. 1 atm = 14.6959 psi. Atmosphere is a mixture of different gases. All these gas molecules together constitute some weight. By virtue of this weight there is some pressure exerted by the atmosphere on all the objects. This pressure is known as atmospheric pressure.Units of Pressure:-1.SI unit: Pascal (Pa)\tPressure is always measured by taking sea level as the reference level. At sea level P=1.01*105 Pa.\tAtmosphere (atm)\tReference level is at sea level.Pressure equivalent of 76cm of Hg column1atm=76cm of Hg column1atm=1.01*105 Pa\t\t |
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