. The Ontario high school physics. TE QUESTIONS AND PROBLEMS 1. Why does sprinkling the floor have a cooling effect on the air of therooni ? 2. As exhaustion of air proceeds, a cloud is frequently seen in thereceiver of an air-pump. Explain. 3. Under wliat conditions will fanning cool the face ? 4. Why can one see his breath on a cold day ? 5. In eastern countries and at high elevations water is poured intoporous earthenware jars and placed in a draught of air to cool. Explainthe cause of cooling. 6. Dew does not usually form on a pitcher of ice water standing in aroom on a cold winter day. Ex
. The Ontario high school physics. TE QUESTIONS AND PROBLEMS 1. Why does sprinkling the floor have a cooling effect on the air of therooni ? 2. As exhaustion of air proceeds, a cloud is frequently seen in thereceiver of an air-pump. Explain. 3. Under wliat conditions will fanning cool the face ? 4. Why can one see his breath on a cold day ? 5. In eastern countries and at high elevations water is poured intoporous earthenware jars and placed in a draught of air to cool. Explainthe cause of cooling. 6. Dew does not usually form on a pitcher of ice water standing in aroom on a cold winter day. Explain. 7. Why does a morning fog frequently disappear Avith increased strength of the suns rays ? 8. A tube having a bulb at each end has oneof its bulbs filled with water, the remainingsjjace containing nothing but water empty bulb is surrounded by a freezingmixture (Fig. 292), and after a time it is foundthat the water in the other bulb is (Such a tube is called a cryophorus,which means frost-carrier.). Fig. 292.—Cryophorus. CHAPTER XXX
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