18 FIRST YEAR COURSE IN GENERAL SCIENCE 



3. Was the laboratory thermometer accurate as judged 

 by your answers to (2)? 



4. Was yaur own thermometer accurate, judged in the 

 same way? 



5. Tell how the accuracy of a thermometer at the boiling 

 point might be tested. 



EXERCISE XI (Textbook 83) 

 QUANTITY OF HEAT 



APPARATUS: Pieces of brass or iron of about the same 

 weight; some pieces about twice as heavy; thermometer; 

 tumbler of water which has been standing in the room for 

 some time; kettle of hot water (about boiling). The metals 

 should have a thread tied around them so that they can be 

 lifted from the hot water. 



DIRECTIONS FOR WORK : 



(1) Place the small metal objects in hot water until 

 thoroughly heated. Fill the tumbler f full with water at 

 room temperature. Observe and record to .5, in the table 

 below, the temperature of water in the tumbler. Quickly 

 transfer one hot metal to the water in the tumbler, and 

 while stirring the water carefully with the thermometer, 

 read the highest temperature indicated. 



(2) Repeat with fresh water at room temperature in the 

 tumbler. This time place a larger body of the same metal, 

 or two of the same size as in (1) in the water. Record data 

 in tables below. 



