• PRESSURE AND RELATIVE HUMIDITY
    PHYSICAL GEOGRAPHY

    PRESSURE AND RELATIVE HUMIDITY

    Pressure is defined as the force exerted on the earth’s surface and other objects by air, because air has weight. On maps, places having equal atmospheric pressure are joined together by lines called Isobars.   FACTORS AFFECTING PRESSURE Altitude: When air descends, its pressure and temperature rise but when it ascends, it becomes less dense and its pressure and temperature fall. In other words, pressure decreases as altitude increases. Temperature: When the temperature of the air increases, its pressure decreases and when the temperature decreases, its pressure increases. Wind: It is known that wind blows from a high pressure belt to a low pressure belt. Rotation of the earth: Owing…

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