Question

what is meaning of air.
free points​

Answer 1

the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.

Answer 2

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What is meant by Air ?

Air is the general name for the mixture of gases that makes up the Earth's atmosphere. This gas is primarily nitrogen (78%), mixed with oxygen (21%), water vapor (variable), argon (0.9%), carbon dioxide (0.04%), and trace gases. Pure air has no discernible scent and no color.

Importance of air

All living beings need oxygen for respiration. The animals that live both on land and even the aquatic animals need oxygen to exist otherwise they would all perish. Air is the fundamental building block, apart from which life itself would not exist.

Pollution of Air

Air pollution refers to any physical, chemical or biological change in the air. It is the contamination of air by harmful gases, dust and smoke which affects plants, animals and humans drastically.

Methods to control Air Pollution

• Use of unleaded petrol in vehicles
• Use of CNG
• Avoid burning of crackers
• Afforestation
• Enforce strict anti- polluting measures.