Air is the name given to atmosphere used in and Dry air contains roughly (by volume) 78.09%, 20.95% 0.93% 0.039% and small amounts of other gases. Air also contains a variable amount of on average around 1%. While air content and varies at different layers, air suitable for the survival of and is currently known only to be found in Earth's and artificial atmospheres.
The atmosphere of Earth is a layer of surrounding the planet that is retained by Earth's The protects by absorbing, warming the surface through heat retention (and reducing extremes between and
describes the structure of the atmosphere, dividing it into distinct layers, each with specific characteristics such as temperature or composition. The atmosphere has a mass of about 5×1018kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and An altitude of 120 km (75 mi) is where atmospheric effects become noticeable during of spacecraft. The, at 100 km (62 mi), also is often regarded as the boundary between atmosphere and outer space.
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