From: gay@sfu.ca   
      
   RichD wrote:   
      
   > On the label of any bottle of booze, beer, or wine, is printed   
   > the alcohol content, as percentage.   How is this measured?   
   >   
   > And, why is it defined by volume?  Chemistry involves   
   > interactions of molecules - matter - not volume.  Shouldn't   
   > the alcohol content be presented as percentage of weight?   
   >   
   > --   
   > Rich   
   And even worse, what does % by volume mean in this case? The volume   
   of ethanol-water solutions is notoriously different from the sum   
   of the volumes of the components.   
   --   
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