Chapter 13, Problem 54A

Interpretation Introduction

Interpretation: It is to be explained why liquid stays at a constant temperature while it is boiling.

Concept introduction:

The temperature at which a liquid's vapor pressure equals the pressure surrounding it and the liquid transform into a vapor is known as the boiling point of a substance.

Answer to Problem 54A

Energy is required for liquid molecules to convert to gas.

Explanation of Solution

The more energetic molecules become a gas, leave, and produce bubbles when boiling takes place. They arise to the surface and ascend into the atmosphere. For conversion of liquid to a gas, needs energy and thus, drains thermal energy. The gas molecules also depart from the liquid. Because of this, the liquid's temperature doesn't change while it boils. When water is boiling, for instance, the temperature will not change from 100 °C at 1 atm of pressure.