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Element abundance on earth's crust

  1. Aug 29, 2009 #1
    May any one help me on how to define the units used to define the abundance of elements on earth's crust "It's written ppb(parts per billion by weight)"
    I really fail to define that!!!
     
  2. jcsd
  3. Sep 5, 2009 #2

    chemisttree

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    One ppb is one pound per billion pounds or one gram per billion grams. There are no units since they cancel.

    ie. [STRIKE]pounds[/STRIKE] of silicon/billion [STRIKE]pounds[/STRIKE] crust = ppb silicon in earth's crust
     
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