Question

what is atmosphere????????
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Answer 1

An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.  

Answer 2

Explanation:

The layer of air above the earth is called atmosphere. The air in our atmosphere extends upto 300 kilometres above the surface of Earth. The atmosphere contains a tremendous amount of air. ... Atmospheric pressure is the air pressure which is exerted by the weight of air present in the atmosphere.