Transcription of Air Around us W - NCERT
{{id}} {{{paragraph}}}
Example: biology
Air Around us W - NCERT
15 Air Around usWe have learnt in Chapter 9 thatall living things require , have you ever seen air?You might not have seen air, but, surelyyou must have felt its presence in somany ways. You notice it when theleaves of the trees rustle or the clotheshanging on a clothes-line sway. Pagesof an open book begin flutteringwhen the fan is switched on. The movingair makes it possible for you to fly yourkite. Do you remember Activity 3 inChapter 5 in which you separated thesand and sawdust by winnowing?Winnowing is more effective in movingair. You may have noticed that duringstorms the wind blows at a very highspeed.
the respiratory system. Do you recall being scolded by your parents when you breathe through your mouth? If you do that, harmful dust particles may enter your body. We may conclude, then, that air contains some gases, water vapour and dust particles. The gases in air are mainly nitrogen, oxygen, small amount of carbon dioxide, and many other gases.
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: