Question

55 Air present in the atmosphere will be defined as what? Name the major constituents of air. Give their volume proportions in air.

Answer 1

Air is made up of a mixture of various gases. Although we cannot see or smell the air, it is present all around us. Air is required for the survival of all living beings. Without air, living organisms cannot survive.

The major composition of air is oxygen, nitrogen, carbon dioxide, etc. It is composed of

Gases	Composition
Nitrogen	$78\%$
Oxygen	$20.95\%$
Hydrogen	$0.005\%$
Argon	$0.93\%$
Carbon dioxide	$0.04\%$
Neon	$0.0018\%$
Helium	$0.005\%$
Krypton	$0.0001\%$
Xenon	$8.7\times {10}^{-6}\%$