Air Around Us Class 6 notes - Chapter 15

What is the Composition of Air?

Air is present all around us. We can feel the presence of air but cannot see the air around us. Air is a mixture of gases. The different components of air includes – 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and about 1% water vapour. Air plays an important role in breathing and burning. The existence of life on the planet earth is mainly because of the presence of air.

How is the oxygen in the atmosphere replaced?

As we all know, air contains only 21% oxygen. All living organisms including the plants require oxygen for breathing. Plants play an important role in the balance of oxygen and carbon dioxide in the atmosphere and are maintained through the process of photosynthesis.

Photosynthesis is a biological process in which all green plants synthesize their food in the presence of sunlight, water, and carbon dioxide. Oxygen gas is the most important by-products of this process.

Important Questions

  1. What is Moisture?
  2. What is Air pressure?
  3. What is the composition of air?
  4. Prove with an experiment that air supports burning?
  5. What are the structural components of the atmosphere?

Learn more about the Water from the topics given below:


Practise This Question

Silkworms are a kind of worms which live on mulberry trees.

State True/False.