| Math Fun Library |  | 
	  
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	 	| Question : | 
	 
	 
	 		| How are the smallest measurements expressed ? | 
 
	  
	 	| Answer :
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			    | There are two units in the measure of all small distances, the 
                  Micron(m) and the Angstrom unit (Å.u.). | 
		
			    | A Micron is the millionth of a metre and there are about 25000 
                  microns in an inch. One Angstrom unit equals one ten thousand 
                  millionth of a metre. One Micron equals 10,000 times the length 
                  of an Angstrom unit. | 
		
		
			    | Breadth of a hair = 75b Diameter of red blood corpuscle = 2m
 Diameter of spherical bacterium = 0.5m
 Diameter of molecule of water = 0.00205m or 2.5 A.m.
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