HEAT OF CHANGE OF STATE 31 



A large amount of water, at a moderate temperature, may 

 contain more heat than a smaller amount of water at a higher 

 temperature. 



References : 



1. 1803 : 175. Unit of Heat The Calorie. 



a. 1801 : 269-270. Measurement of Heat. 



6. 1802 : 272. Measurement of Heat. 



c. 1804:260-261. Thermal Units. 



d. 1805 : 316. Measurement of Heat. 



e. 1806:341. Measure of Heat. 

 /. 1807 : 182. The Heat Unit. 



fir. 1808 : 237. The Measurement of Heat. 



h. 1809 : 179. The Unit of Heat The Calorie. 



Experiment 13. Quantity of Heat Comparison. 

 Apparatus: Burner, ring stand, asbestos mat, beakers, 

 100 c.c., 150 c.c., 200 c.c., thermometer. 



a. Boil some water in the 150 c.c. beaker and have 50 c.c. 

 of water in the 100 c.c. beaker, and 150 c.c. of water in the 

 200 c.c. beaker, both of the same temperature. Completely 

 fill these two beakers with boiling water, thus adding 50 c.c. 

 to 50 c.c., and 50 c.c. to 150 c.c. Take the temperature of 

 each, after stirring. Which has the higher temperature? 

 What is the relative amount of change in degrees? 



b. Since the same amount of heat was added in each case, 

 draw your conclusions in regard to the relation between heat 

 and temperature. 



23. HEAT OF CHANGE OF STATE 



There is another rather peculiar change, caused by heat, 

 which is called change of state. By this is meant the passing 

 from the solid to the liquid form, and from the liquid to the 

 gaseous. A liquid contains more heat energy than does the 



