Important Topics
1. Cooling effect of evaporation, rate of evaporation affected by six conditions.
2. Effects of molecular motion in solids: (a) Expansion, (b) Evaporation, (c) Sublimation.
Exercises
1. Does sprinkling the streets or sidewalks cool the air? Why?
2. Give an illustration for each of the factors affecting evaporation.
3. Give an illustration for each of the three evidences of molecular motions in solids.
4. Since three-quarters of the earth's surface is covered with water, why is not the air constantly saturated?
5. If the air has the temperature of the body, will fanning the perfectly dry face cool one? Explain. Will the effect be the same if the face is moist? Explain.
6. What is the cause of "Cloud Capped" mountains?