238 ELEMENTARY AGRICULTURAL CHEMISTRY 



100 lb. (as its name implies) in America, South Africa, and 

 other places. 



The metric system, which is gradually gaining in popularity 

 is free from many of the objections of our British units, and 

 has the great advantage that the various units are connected 

 together in a simple and uniform manner. 



It is unnecessary to give here the fundamental units and 

 method of decimal multiples and sub-multiples of the metric 

 system, but the connection between metric and British units 

 may be useful. 



Units of Letigth. 



1 centimetre = 0'393708 inch. 



1 metre = 39-3708 inches = 3'2809 feet = 1-0936 yards. 



1 kilometre = 3208-9 feet = 1093-63 yards = 0-62138 mile. 



Or 



1 inch = 2-53995 centimetres. 

 1 foot = 0-30479 metre. 

 1 yard = 091438 metre. 

 1 mile = 1-609315 kilometres. 



Units of Area. 

 1 square metre = 1550 square inches = 10-764 square feet 



= 1*196 square yards. 

 100 square metres (1 are) = 1076-4 square feet = 1196 



square yards = 0*0247 acre. 

 10,000 square metres (1 hectare) = 11,960 square yards = 



2-4711 acres. 



Or 



1 square inch = 6*45137 square centimetres. 



1 square foot = 9*290 square decimetres = 0*0929 



metre. 

 1 square yard = 0-8361 square metre. 

 1 acre == 0-40467 hectare = 4046*7 square metres. 



