36 EXPERIMENTAL GENERAL SCIENCE 



gram. The latter is commonly abbreviated to kilo. One 

 thousand kilograms is called a metric ton. The standard of 

 volume (or size) is the liter (pronounced leeter). It is equal 

 to a thousand (10 X 10 X 10) cubic centimeters. The divi- 

 sions and multiples of the liter are the same as in the other 

 standards. The denominations most commonly used are the 

 liter and the hectoliter. Instead of milliliters small quantities 

 are usually expressed in cubic centimeters which are the equiva- 

 lent of milliliters. Instead of the kiloliter its equivalent, the 



FIG. 7. Standard kilogram. (Black and Davis.} 



cubic meter, is more frequently used. Copies of the standard 

 kilogram and of the liter are preserved at the Bureau of Stand- 

 ards at Washington. This Bureau is also charged with a gen- 

 eral supervision of our weights and measures. It not only 

 furnishes correct standards of measures for length, weight, and 

 volume, but also supplies standard thermometers, pyrometers, 

 photometers and many others. 



Practical Exercises 



1. Construct the table of lengths beginning with the millimeter and 

 nding with the kilometer as follows: 



