112 Introduction to the Study of Science 



20. What substances besides gases transfer heat by convection? 



21. How would you show that water transfers heat by convection? 



22. What use is made of water in conveying heat from one place to 

 another? 23. Describe how you would show water's capacity for 

 heat in comparison with that of other materials. 24. How does the 

 heat capacity of water make it especially useful in heating by convec- 

 tion? 25. Why is water taken as the standard in measuring the heat 

 capacity of different substances? 26. Give instances of convection 

 currents that are important in climate. 



27. How is ventilation related to heating by convection ? 28. What 

 kind of air should we have in our homes, schools, churches, and other 

 buildings to insure us good health and vigor? 29. What means are 

 used to supply fresh air in our homes and public buildings ? 30. How 

 may the humidity of the warmed air be regulated? 31. How is tem- 

 perature regulated? 



32. Give facts which prove that one sitting before a fire may be 

 warmed by a way of heat transfer which is neither conduction nor 

 convection. 33. Give facts showing that the sun's energy does not 

 warm the earth by conduction or convection. 34. What does the 

 reading glass show? 35. What direction do heat rays follow? 

 36. How can you prove this? 37. In what conditions does a body 

 radiate energy? 38. Explain how energy is radiated by a body. 

 39. What medium transmits radiant energy? 40. How is a body 

 heated by radiation? 41. What effect does a rise in temperature 

 have upon a body? 42. What happens to a body in giving off heat? 



43. What other effects does radiant energy produce besides heat? 



44. How would you show that the color and character of surface of a 

 body affect its capacity for absorbing heat? 45. For retaining heat? 

 46. Of what use is the knowledge of this in selecting cooking utensils? 

 In selecting fabrics for clothing ? 



SUGGESTIVE QUESTIONS 



1. What sort of material, wood, stone, or iron, would you select 

 in building a house for comfort in a hot climate ? In a cold climate ? 

 Explain. 2. What advantages and disadvantages would a heating 

 stove made of white tile have ? Why ? 3. Why is the air in the gal- 

 lery of a theater more uncomfortable in hot weather than that of the 

 main floor? 4. Would a hothouse made with oiled paper instead of 

 glass be satisfactory ? Explain. 5. How could a house be safely heated 

 in cold weather by conduction ? 6. Suppose heat were not transferred 

 by convection in air and water. What would be the chief climatic 



