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The value of avagadro number is given in my book as 6.02217(4). Does this mean 6.022174 or 6.02214? Even some numbers have (12) like two digit numbers. Also what is this notation called? Why is it used for? Can't they use percentage or absolute errors?

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    $\begingroup$ I would read it as an absolute error based on a multiple (in brackets) of the least significant digit shown in the main result so in your example $6.02217\pm0.00004$ so between $6.02213$ and $6.02221$ $\endgroup$
    – Henry
    Feb 11, 2022 at 14:37
  • $\begingroup$ See the paragaph starting "In the last notation, parentheses are the concise notation ..." at en.wikipedia.org/wiki/Uncertainty#Measurements $\endgroup$
    – Henry
    Feb 11, 2022 at 14:43
  • $\begingroup$ Thanks. I think it is used contract things a little bit to look nice $\endgroup$
    – JRBros
    Feb 11, 2022 at 15:10

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