160 Domestic Science 



stirring, till it has attained a temperature of 60 C., 

 as shown by a thermometer. Pour the hot water 

 quickly into the beaker containing the larger quantity, 

 stir well, and note the highest temperature recorded by 

 a thermometer placed in the mixture. 



Next heat 500 c.c. of water to 60 C. and pour this 

 into 500 c.c. of cold water at as nearly as possible the 

 same temperature as that previously used. Stir and 

 again note the highest reading given by a thermo- 

 meter immersed in the mixture. 



The temperature of the latter mixture will be 

 observed to be considerably higher than that of the 

 former, thus showing that the larger quantity of hot 

 water gave up more heat to the cold water than did 

 the other, although both quantities of water were at 

 the same temperature originally. 



From the above considerations, it is clear that the 

 temperature of a body and the quantity of heat contained 

 in the body are quite different things. The temperature 

 is entirely independent of the mass of the body, while 

 the heat-content is very materially affected thereby. 



EXPERIMENT 53. Pour 100 c.c. of cold water into 

 each of two beakers, and note the temperature in 

 each case. Weigh a lump of lead (or other convenient 

 metal) and place it in a third beaker. Pour into this 

 beaker as many c.c. of water as the number of grams 

 in the weight of the lead. Heat the beaker and its 

 contents to a temperature of 60 C., with constant 

 stirring. Remove the lead, quickly wipe it dry, and 

 place it in one of the beakers containing cold water 

 previously prepared. Stir well and note the tempera- 

 ture reached by the water. Pour the warm water into 

 the second supply of cold water, stir, and note the 

 highest temperature attained. 



