LARGER UNITS OF LENGTH 9 



equal to the length of a certain number of light-waves (c/. 179), so 

 that if all the standard meters were destroyed, a new, perfect meter 

 could be obtained. 



10. Metric Tables of Length, Area, and Volume. 



The metric table of length (Fig. 7) is 



10 millimeters (mm.) = 1 centimeter. 

 10 centimeters (cm.) = 1 decimeter. 

 10 decimeters (dm.) = 1 meter. 

 1000 meters (m.) = 1 kilometer. 



1 kilometer (km.) =0.6214 mile. 



For surface measure the table is 



100 square millimeters = 1 square centimeter. 

 100 square centimeters = 1 square decimeter. 

 100 square decimeters = 1 square meter. 



For cubic measure the table is - 



1000 cubic millimeters (c. mm.) = 1 cubic centimeter. 



1000 cubic centimeters (c.c. or c.cm.) = 1 cubic decimeter. 

 1000 cubic decimeters (c. dm.) = 1 cubic meter. 



One cubic decimeter is called a liter (pronounced leter). 

 It is a little larger than a U. S. liquid quart. As the last 

 table shows, the cubic decimeter, and therefore the liter, 

 contains 1000 cubic centimeters. The relation between 

 metric units and other ordinary units is shown in the 

 Appendix, Table II. 



11. Larger Units of Length. For distances on the earth the mile 

 (5,280 feet) and the kilometer (3,281 feet) are convenient units. But 

 when we express, in miles, the distance of the earth from the sun, the 



