IAS (Admin.) Mains Geography Climatology-Temperature and Pressure Belts of the World Study Material (Page 7 of 24)

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Pressure: Measuring Atmospheric Pressure

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Atmospheric pressure is the force per unit area exerted against any surface by air weight above that surface in earth՚s atmosphere. In most cases, atmospheric pressure is close to hydrostatic pressure caused by weight of air above the measurement point. Low-pressure areas have less atmospheric mass above their position. As height increases, there is less overlying atmospheric mass. Thus, pressure reduces with increasing height.

Understanding Pressure

Air is tangible material substance and as a result has mass. All objects having mass are influenced by gravitational force. This force of…

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Pressure: Vertical Distribution of Pressure

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Vertical Distribution of Pressure

Vertical pressure changes by altitude

Illustration 1 for Vertical Distribution of Pressure

With height, density and pressure of air decreases. In the graph below, air pressure is 1013 millibars (mb) or 1 kg/cm2 of surface area. Near earth՚s surface, pressure decreases with height at rate of 3.5 mb for every 30 m. In addition, over cold air pressure decre…

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