Chapter 23, Problem 27A

a.

To determine

To Explain: The substance that cools and warms in evaporation process.

Answer to Problem 27A

The surface will cool, and the surrounding will warm.

Explanation of Solution

Introduction:

During evaporation, a liquid is converted into the vapors.

The surface will be cooled as the heat is absorbed by the surrounding.

Conclusion:

Thus, the surface will cool & the surrounding will warm.

b.

To determine

To Explain: The substance that cools and warms in the condensation process.

Answer to Problem 27A

The surface will warm, and the surrounding will cool.

Explanation of Solution

Introduction:

During condensation, steam gets converted into liquid.

The surface will be warmed as the heat absorbed by the surface.

Conclusion:

Thus, the surface will warm & the surrounding will cool.