16 APPLIED SCIENCE 



WEIGHTS 



1 g. = .0527 ounce (oz.) 1 oz. = 28.35 g. 



1 kg. = 2.2046 pounds (Ibs.) 1 Ib. = .4536 kg. 



1 metric ton = 1.1023 English tons 1 English ton = .9072 met- 

 ric ton 



APPROXIMATE ENGLISH EQUIVALENTS 



1 dm. =4 in. 1 1. - 1.06 quarts (qt.) 



1m. =1.1 yds. liquid .9 qt dry 



1 km. = % mi. 1 hi. = 2^gbushels (bu.) 



1 hektar = 2 1 A acres 1 kg. = 2^5 Ibs. 



1 stere, or cu. m. = % cord (cd.) 1 metric ton = 2200 Ibs. 



19. Care in Using Right Units. In performing all cal- 

 culations care is required to see that the correct units are 

 used. Oftentimes, through haste and confusion, inches in- 

 stead of being first changed into feet are multiplied by 

 feet to obtain area in square feet. This error is often over- 

 looked because there are many formulas or rule-of-thumb 

 methods that have been abbreviated to their lowest terms 

 by cancellation so that in their final form it is possible to 

 multiply inches by feet or pounds. Therefore in using a 

 formula, care should be exercised to see that it is correct 

 and that the proper units are employed. 



To illustrate: the formula for determining the thickness of a lead 

 pipe necessary for a given head of water is: 



h X s 



rrj _ 



where T is thickness of pipe in inches, s is size of pipe expressed 

 s decimal of an inch, and h is the head of water in feet. 



