AIR

A mixture of gases that make up the atmosphere of the earth. The most important gases that constitute dry air are nitrogen (N2) at 78.09%, oxygen (O2) at 20,946%, argon (A) at 0.93% and carbon dioxide (CO2) at 0.33%. Water vapour (H2O) is one of the main components of air as well as one of the most important gases of meteorology.