What is atmosphere and atmospheric pressure

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The atmosphere is a layer of gases which surrounds the entire Earth. It consists mainly of nitrogen, oxygen, as well as a few other gaseous elements. The purpose of atmosphere is to prevent excessive amounts of radiation from reaching the Earth.

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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