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Question
Name the components of air with their approximate percentage by volume in air. Does the percentage by volume of each component remain the same, in the atmosphere of different parts of the world? Explain with reasons.
Solution
The main components of the air are :
- Nitrogen
- Oxygen
Composition of air by volume:
Nitrogen: 78% or 4/5 th
Oxygen: 21% or 1/5 th
Carbon dioxide: 0.03 - 0.04%
Inert gases: 0.9%
[Water vapours, dust particles, other impurities]: variable
OR
| Gases | Percentage | Figure |
| Nitrogen | 78% |  |
| Oxygen | 21% | |
| Carbon dioxide | 0.03 - 0.04% | |
| Inert gases | 0.9% | |
| Water vapour | Varies | |
| Dust particles | Varies | |
| Other impurities | Varies |
Air is a mixture whose composition varies at different intervals of time and different places of the world.
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