Chapter 13.2, Problem 16LC

Interpretation Introduction

Interpretation:

It is to be explained why evaporation lowers the liquid’s temperature.

Concept Introduction :

As a liquid transforms into a gas, evaporation, a sort of vaporization, occurs on the liquid's surface.

Answer to Problem 16LC

The average kinetic energy of remaining liquid molecules decreases.

Explanation of Solution

A minimum energy called threshold energy is required by liquid molecules to escape. When liquid molecules reach a specific threshold of kinetic energy, they erupt from the surface and turn into vapor. The liquid molecules that are still present now have less kinetic energy as a result. The temperature of the remaining liquid drops while evaporation takes place.