. Laboratory lessons in general science . is boil-ing hold an inverted wide-mouthed bottle whose sides aredry and cool. Describe what takes place. What relationis there between the processes of vaporization and con-densation f What causes condensation of the moisturepresent in the atmosphere? In what ways (two or more)does this come about? 3. How is it that in some regions of earth a sudden andextreme fall in temperature may cause no precipitationeither of rain or snowT ? What is true of the general characterof a region, and its fitness for habitation, where the atmos-phere is commonly destitu
. Laboratory lessons in general science . is boil-ing hold an inverted wide-mouthed bottle whose sides aredry and cool. Describe what takes place. What relationis there between the processes of vaporization and con-densation f What causes condensation of the moisturepresent in the atmosphere? In what ways (two or more)does this come about? 3. How is it that in some regions of earth a sudden andextreme fall in temperature may cause no precipitationeither of rain or snowT ? What is true of the general characterof a region, and its fitness for habitation, where the atmos-phere is commonly destitute of moisture ? In regions that WATER, AND ITS USES 43 are far away from large bodies of water, how do youaccount for a supply of atmospheric moisture sufficient foran ample rainfall? 4. Describe the differencein conditions that result inthe formation of (a) dewand rain; (b) white frost andsnow; (c) fog and cloud. Why is it that steam isvisible near the mouth ofa teakettle of boiling waterand disappears a little far-ther outward? Why is. Fig. 18. — Great cloud masses resultfrom the condensation to minutewater particles of the water vaporin ascending air currents. there no appearance of this steam close to the outlet?5. When should a gaseous form of matter be spoken ofas a vapor rather than as a gas ? HEAT OF VAPORIZATION, AND OF FUSION 1. Take frequent temperature readings as the teacherheats some ice cold water containing small lumps of water must be stirred continuously with a thermometer,and heated slowly till the ice is melted and the water the temperature (a) at the beginning ; (b) from timeto time while the ice is melting; (c) during the time untilthe water boils; (d) while the boiling water is heated moreand more. 2. Observe the temperature of the room as registeredby a thermometer. Wet the bulb of the thermometer withalcohol (or water), and wave it back and forth in the the lowest temperature it records. 44 LABORATORY LESSONS IN GENER
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