Air contains gases like oxygen, carbon dioxide, nitrogen, inert gases, water vapour and dust particles.
The uses of constituents of air are as follows :
|
Gases |
Proportion in atmosphere |
Uses |
| (a) |
Nitrogen |
78% |
(i) Helps in building necessary proteins.
(ii) In production of ammonia.
(iii) Air tight packaging of foodstuff. |
| (b) |
Oxygen |
21% |
(i) Used in combustion.
(ii) Necessary for respiration. |
| (c) |
Carbon Dioxide |
0.03% |
(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 vapour |
0.7% |
(i) Used in formation of cloud,fog,dew etc.
(ii) Spread sunlight in all directions. |
