Chapter 13, Problem 20Q

To determine

To Explain: The reason for the ratio of ${\text{N}}_{\text{2}}$ molecules to be higher than ${\text{O}}_{\text{2}}$ as a person goes higher in earth atmosphere.

Explanation of Solution

Introduction:

The existence of a gas at particular height of the earth atmosphere depends on the density of the gas and the escape velocity.

The ${\text{O}}_{\text{2}}$ molecules are heavier than the ${\text{N}}_{\text{2}}$ molecules. The lighter gases( ${\text{N}}_{\text{2}}$ ) has higher average speed or escape velocity. This helps the ${\text{N}}_{\text{2}}$ molecules to flow at higher level of the atmosphere as compared to the ${\text{O}}_{\text{2}}$ molecules.The heavier gases can go up to limited height at the atmosphere.

Conclusion:

Thus, the ratio of ${\text{N}}_{\text{2}}$ molecules to be higher than ${\text{O}}_{\text{2}}$ as a person goes higher in earth atmosphere.