What is atmospheric pressure?
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It is a pressure exerted by 76 cm of Mercury column at 0°C and at sea level.
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We know the envelope of different gases surrounding the earth is known as the atmosphere. It extends up to a few thousand kilometres. The pressure exerted by the weight of these gases in the atmosphere is known as atmospheric pressure. It is the force exerted on a unit area of surface by the weight of air above that surface.
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