Air


 
 
Concept Explanation
 

Air and Its Properties

Air

It is a mixture of gases that makes up the earth’s atmosphere. Air is  composed of about 78% nitrogen(N_2) , 21% oxygen(O_2) ,0.9% argon(Ar) ,0.1% other gases. Trace amount of  carbon dioxide (CO_2), methane(CH_4), water vapours and neon are some of the other gases that make up the remaining 0.1%. The proportions of water vapour and dust decrease with altitude. Air contains no water vapour beyond 12 km above sea level. The amount of dust also decreases with altitude.

Properties of Air : 

The properties of air are:

  • Air takes up space as it consists our atmosphere.
  • As air is a mixture of different gases and other substances, therefore it has mass.
  • Air gets affected by heat. With increase of temperature air become thinner and with decrease in the temperature air  gets heavier.
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    Sample Questions
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    Question : 1

    The dust particles move in a ____________________ way in a beam of light .

    Right Option : B
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    Question : 2

    Which of the following statements about is correct?

    Right Option : D
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    Question : 3

    Plants use _________________________  for preparing food which in turn gives food to the entire Living world

    Right Option : B
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