The world we live in an atmosphere (atmosphere) covered with a height of 2,000 kilometers from the ground. Layer of the atmosphere, the air that humans breathe it has remained ever since the earth's stratosphere layer lasting only. The above is not an atmosphere of air. Atmospheric air to breathe contains. About 78 percent nitrogen, oxygen, carbon dioxide and inert gas, about 21 percent to 0.97 percent of the gas in the atmosphere also contains a steam cleaner. Particles and microorganisms with different surface temperature varies according to altitude. It is used as a criterion to divide into 4 floors, the atmosphere.
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