Chapter 14.2, Problem 6RQ

Interpretation Introduction

Interpretation: The differences between boiling point and evaporation needs to be explained.

Concept introduction: Boiling point can be defined as a temperature where vapor pressure of the liquid becomes equal to the normal atmospheric pressure (1 atm) and hence the liquid gets converted into gaseous state.

Evaporation is conversion of liquid into vapor below the boiling point of the substance.

Answer to Problem 6RQ

There are many differences between boiling point and evaporation in terms of surface area, rate, temperature and source of energy.

Explanation of Solution

Difference between boiling point and evaporation are given in tabular format.

Boiling Point	Evaporation
It occurs throughout the bulk of the liquid.	It happens only over the surface of the liquid.
It occurs at particular temperature which is varies for different liquids.	It occurs at all temperature.
It is a quick process.	It is a slow process.
External source of energy needed to heat the liquid.	It takes energy from the surroundings.

Conclusion

There are many differences between boiling point and evaporation in terms of surface area, rate, temperature and source of energy.