Transcription of Air - NCERT
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Air - NCERT
4 Air Do you know? Our earth is surrounded by a huge blanket of air called atmosphere. All living beings on this earth Carbon dioxide depend on the atmosphere for their survival . It released in the provides us the air we breathe and protects us from atmosphere creates a the harmful effects of the sun's rays. Without this green house effect by blanket of protection, we would be baked alive by the trapping the heat heat of the sun during day and get frozen during radiated from the night. So it is this mass of air that has made the earth. It is therefore temperature on the earth liveable. called a greenhouse gas and without it the COMPOSITION OF THE A TMOSPHERE. earth would have been too cold to live in. Do you know that the air we take in while breathing is However, when its actually a mixture of many gases? Nitrogen and oxygen level in the are two gases which make up the bulk of the atmosphere increases atmosphere. Carbon due to factory smoke dioxide, helium, or car fumes, the heat ozone, argon and retained increases the hydrogen are found temperature of the in lesser quantities.
survival. They can not take 4 Air Fig. 4.1: Constituents of Air Do you know? Carbon dioxide released in the atmosphere creates a green house effect by ... protective space suits filled with air when they go to the moon. If they did not wear these space suits, the counter pressure exerted by the body of the astronauts would
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