EXERCISE 10 



WHAT IS THE RELATION BETWEEN THE FAHRENHEIT AND CENTIGRADE 



THERMOMETER SCALES? 



Materials. Fahrenheit and centigrade thermometers ; cups half filled with water. 



Directions. Two persons may work together. They must have a centigrade and a Fahrenheit 

 thermometer. Place both of these in water, and read both at the same time without removing them 

 from the water. Record the readings in two parallel columns below, placing readings made at the 

 same time opposite each other. After either warming or cooling the water, record the readings again. 

 Do this for five or six different temperatures, recording your results. If possible, use a mixture of 

 ice and water for one of the trials and hot water (almost boiling) for another. 



The relation between the two scales can be determined by comparison of any two sets of readings. 

 What is the number of divisions (degrees) on the Fahrenheit scale between your highest and lowest 

 readings ? What is the number of degrees on the centigrade scale between the corresponding read- 

 ings ? On which scale is the number of degrees between the two points the greater ? A single 

 degree on the centigrade scale is equivalent to how many degrees on the Fahrenheit? 



Check your results by calculating from any other two sets of readings and by reference to your 

 textbook. 



c. 



F. 



Additional problems. The temperature of the human body is usually about 98.6 F. What is the tem- 

 perature in the centigrade scale ? 



The usual temperature of a good living room is about 20 C. AVhat is the temperature in the Fahrenheit 

 scale ? 



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