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   '''A''' = The cross sectional area which the substance is to diffuse across  
 
   '''A''' = The cross sectional area which the substance is to diffuse across  
 
   '''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas   
 
   '''C<sub>1</sub> C<sub>2</sub>''' = The concentrations in the two areas   
 
   
   '''L''' = distance separating the two areas
 
   '''L''' = distance separating the two areas
  
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