34 LABORATORY MANUAL 



CHAPTER IV 

 MEASUREMENT OF TEMPERATURE 



Exercise 13. Thermometers. 



Object: A comparative study of thermometers. 



Apparatus 



Fahrenheit thermometer Metric rule 



Centigrade thermometer 



Directions: Examine a thermometer carefully. 

 How is it made? Note the markings on the scale. 

 What do they indicate? What two points on the 

 thermometer seem of special importance? On this, 

 the centigrade thermometer, zero degree is the freezing 

 point of water and 100 degrees the boiling point. Can 

 you suggest a way of determining these points ? After 

 they are located how would you find the length on 

 the scale of one degree? 



On your note paper make a drawing of a thermom- 

 eter. On the right side of the line place two points, 

 one for the boiling point, the other for the freezing 

 point. Between these points mark the 10, 20, 30, etc., 

 to 100 degrees. Continue the line representing the 

 thermometer tube below degrees far enough to admit 

 negative 40 degrees. On the left side mark 212 degrees 

 opposite boiling and 32 degrees opposite freezing. 

 How many degrees on this, the Fahrenheit ther- 

 mometer, are there between freezing and boiling? On 



