Air is a mixture of gases, and forms atmosphere of the Earth. In other words, air is the atmosphere of the Earth. The planet Earth is surrounded by the air which protects life on Earth by regulating temperature and pressure.
The Air is composed of:
| Component | Composition (by Volume) |
| Nitrogen | 78% |
| Oxygen | 21% |
| Noble gases | 1% (mainly argon) |
| Carbon Dioxide | 0.04% |
Nitrogen
Nitrogen gas is essential for the formation of all animal and plant proteins.
Oxygen
All animal and plants need Oxygen for respiration. Oxygen is essential for combustion.
Carbon Dioxide
Carbon dioxide is used as fire extinguisher. It is used to deep-freeze and preserve food. It is also used in carbonated drinks.