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What does it mean, formally, when we say that a digit in a number is a significant figure?

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  • $\begingroup$ It generally means ignoring the lower order digits in a number that resolves to too great a detail given the approximations in a calculation, or also in an experiment, the estimated errors. $\endgroup$ Jan 18, 2018 at 12:10
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    $\begingroup$ More on significant figures. $\endgroup$
    – Qmechanic
    Jan 18, 2018 at 12:39

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