PART III. HEAT IN THE HOME 



CHAPTER XI 

 FUELS AND THEIR USES 



Problems. i . To learn about fuels and their relative 

 values. 



2 . To find out what burns in fuels. 



3. To learn the difference between " heat " and " tem- 

 perature" 



4. What is the kindling temperature? 



5. How is heat transferred? 



Experiments. 



1. To find out if all substances take fire at the same temperature. 



2. To see if heat will travel along a metal rod. 



Project I. To MAKE A HOUSE THERMOMETER. 

 i Decide what materials are needed, and whether you will make 

 an alcohol or a mercury thermometer. 



2. Practice glass working so that you can blow bulbs in common 

 glass tubing before trying thermometer tubing. Do not try tub- 

 ing with a bore smaller than one millimeter. 



3. The essential operations to learn are : making the bulb, filling 

 it, sealing, and making a graduating scale. 



Suggested Projects. 



I. ARE THE FUELS AT HOME COSTING TOO MUCH? ARE THEY 

 USED EFFICIENTLY? 



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