Percentage of oxygen in air by volume…………..

Percentage of nitrogen in air by volume………….

Percentage of argon in air by volume……………

The percentage of oxygen in air is-

The percentage of CO_2 present in air by volume is

Give reasons for the following: The percentage of oxygen, in air dissolved in water, is higher than the percentage of oxygen in ordinary air.

The percentage by volume of oxygen in air is variable from place to place.

What is the percentage of oxygen by volume in the atmosphere?

Percentage of oxygen and carbon dioxide in air is respectively

(c) Mention the percentage of oxygen in Inspired .Alveolar and Expired air.