World Geography / Climatology
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Pressure varies from one place to the other place and also decreases with altitude resulting in world pressure belts and planetary winds. Atmospheric pressure is nothing but the force exerted by the atmospheric column on a unit area of earth's surface. It is measured in the units of kg/cm2 or bars or millibars or length of Mercury (Hg) column in cm or mm. At Mean Sea Level, the pressure is 76 cm of Hg column or 1013 millibars.