Uncertainty about relative atomic mass

  • #1

Main Question or Discussion Point

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
 

Answers and Replies

  • #2
DrClaude
Mentor
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Is it 1.007947? or 1.00794(+/-)0.000007?
Neither. It is the uncertainty in the last digit, so 1.00794 ± 0.00007. (You had a zero too many.)
 

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