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I Uncertainty about relative atomic mass

  1. Apr 25, 2016 #1
    For the uncertainty about relative atomic mass.
    Such as for H-1 there is 1.00794(7)u.
    what exactly does the "7"means?
    Is it 1.007947? or 1.00794(+/-)0.000007? or something else?
    ref: http://www.ciaaw.org/pubs/TSAW-2007.pdf
  2. jcsd
  3. Apr 25, 2016 #2


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    Staff: Mentor

    Neither. It is the uncertainty in the last digit, so 1.00794 ± 0.00007. (You had a zero too many.)
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