1.

What are the various constituents of air? Write their uses.

Answer»

Air contains gases like oxygen, carbon dioxide, nitrogen, inert gases, water vapour and dust particles. 

The uses of constituents of air are as follows :

GasesProportion in atmosphereUses
(a)Nitrogen78%(i) Helps in building necessary proteins.
(ii) In production of ammonia.
(iii) Air tight packaging of foodstuff.
(b)Oxygen21%(i) Used in combustion.
(ii) Necessary for respiration.
(c)Carbon Dioxide0.03%(i) Used in fire extinguishers.
(ii) Used in plant food preparation.
(d)Inert Gases
(1) Argon
(2) Helium
(3) Neon
(4) Crypton
(5) Xenon		0.9%(i) Electric bulb
(ii) Used in airship
(iii) Street light
(iv) Fluorescene tubes
(v) Flash photography
(e)Other constituents like dust,water vapour0.7%(i) Used in formation of cloud,fog,dew etc.
(ii) Spread sunlight in all directions.


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