10 INTRODUCTION TO GENERAL SCIENCE 



c. 1701 : 13. Nature of Oxygen. 



d. 1701 : 16-21. Properties of Oxygen and Combustion. 



e. 1702 : 31-36. Oxygen Preparation, Properties, and Im- 



portance. 



/. 1706:11-18. Oxygen and its Relation to Life. 

 g. 1707 : 36-43. Oxygen and Combustion. 

 h. 1709 : 19-24. Oxygen and Combustion. 



6. FUELS 



The material which combines with oxygen in any combus- 

 tion is called fuel. There are solid, liquid, and gaseous fuels, 

 but all contain a common material carbon. 



The most universal fuel is wood. This is a compound made 

 by growing plants, and consists chiefly of carbon and water 

 combined. 



The other solid fuels are the various kinds of coal, which 

 will be considered in Section 137. 



Liquid fuels are kerosene, gasoline, alcohol, naphtha, ben- 

 zine, ether, turpentine, and other oils. They are all com- 

 pounds of carbon. 



Gaseous fuels are natural gas, artificial gas, and the vapors 

 from several of the liquid fuels. All of the fuels will be 

 studied in Section 137, Coal, and in Section 138, Petroleum, 

 as well as in Section 28, Destructive Distillation. 



References : 



1. 1702: 115-116. Fuels. 



2. 1710:23-32. Fuels. 



a. 1701 : 399-400. Petroleum Products. 

 &. 1704 : 203-205. Fuels from Petroleum. 



