13 



wooden blocks and a horizontal meter stick; determine as 

 accurately as possible the length of the rod. 



Apply heat to the boiler until steam passes rapidly into 

 the tube. The steam which heats the rod must be allowed 

 to escape through some opening, such as E. After the 



FlG. 6. The expansion of an iron rod. 



the 



steam has been issuing five or six minutes, note 

 thermometer reading and measure the rod again. 



What is the increase in the length of the entire rod as a 

 result of the heating ? What was the increase in tempera- 

 ture ? Calculate the increase in the length of each centi- 

 meter of the rod. Then calculate what the increase would 

 have been for each centimeter if the rod had been heated 

 but i. This is the Coefficient of Expansion of iron, and 

 is defined as the increase in the length of a rod I cm. long 

 when heated i. 



