Chapter 12, Problem 79A

Interpretation Introduction

Interpretation:

The formation of dew on cool mornings must be explained.

Concept introduction:

Formation of dew is a condensation process.

Answer to Problem 79A

Heat transfer from air to any cold surface like grass leads to dew formation.

Explanation of Solution

During cool mornings the temperature is low. The water vapor present in air gets chance to condense by transferring heat to the blades of grass. As water vapor cools, it is condensed to tiny water droplet which can be seen as dew on the grass blades.

Conclusion

Dew formation on cool mornings takes place due to condensation process.