Air-
The two mportant functions of air are-1) interchange of gases in the process of respiration 2) regulation of body temperature.
pure air has following composition-
1) Oxygen 20.95%
2) Carbon dioxide 0.03 to 0.4%
3) Nitrogen 79%
4) Water vapour variable
5) Ammonia,Ozone, Argon, Mineral Salt: traces
In open air the composition is fairly constant because of air currents, activities of plants etc. water content in the air are variable. During rainfall or in the vicinityu of the sea, huminity is higher. About 65% to 75% of humidity is considered conducive for health. The wind, the rain, oxygen and photosynthetic activities because of green content in the leaves are the important factors on which purification of air depends.
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