WHAT IS ATMOSPHERIC PRESSURE?
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Atmospheric pressure is the force per unit area exerted on a surface by the weight of air above that surface in the atmosphere of Earth. Atmospheric pressure is measured with an instrument called a "barometer", which is why atmospheric pressure is also referred to as barometric pressure.
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=pressure exerted by the air in the atmosphere is called atmospheric pressure.
=atmospheric pressure at sea level is 101.3kpa(kilopascal) Or 760mm of hg( millimeters of mercury)
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