Chapter 13, Problem 82A

Interpretation Introduction

Interpretation: The effect of condensation on the average motion of water molecules is to be explained. Also, the reason for the motion change is to be explained.

Concept introduction:

Condensation, which is the opposite of vaporization, is the transformation of matter from its gaseous state into its liquid state.

Answer to Problem 82A

The average motion of water molecules decreases due to the loss of energy during the condensation process.

Explanation of Solution

When gas molecules cool, condensation occurs. The molecules slow down as they lose energy and heat. They approach other gas molecules more closely. These molecules gradually unite to form a liquid.