298 ARITHMETIC 



TEMPERATURE 



The temperature of a body is its degree of sensible heat, 

 For the measurement of temperatures there are three kinds of 

 thermometers: the Fahrenheit, abbreviated F. or Fahr., com- 

 monly used in America; the Centigrade, abbreviated C. or 

 Cent., used in France and by scientists everywhere; and the 

 Reaumur, abbreviated R or Reau.. used in Germany. 



Standard Points Degrees F. Degrees C. Degrees R. 



Boiling point of water at "I 



sea level; i. e., pressure > 212 100 80 



= 1 atmosphere J 



Melting point of ice 32 



Absolute zero. i. e., the! 



total absence of heat; > -460 -273 -219 



theoretical only J 



Between boiling point and freezing point = 180 F. = 100 C. 

 = 80R. 



9 9 



Temp. F.=- Temp. C.-f32 =-Temp. R.+32 . 

 5 4 



5 5 



Temp. C. = - (Temp. F. - 32) = - Temp. R. 

 (-9 4 



4 4 



Temp. R. = -(Temp. F. - 32) = -Temp. C. 



, y & 



MISCELLANEOUS TABLES 



The following table is used in counting certain articles: 



12 of anything =1 dozen doz. 



12 dozen =1 gross gr. 



12 gross =1 great gross g. gr. 



20 of anything = 1 score 



units doz. gr. g. gr. 



12= 1 

 144= 12 = 1 

 1,728=144 = 12 = 1 



