What does it mean, formally, when we say that a digit in a number is a significant figure?
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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. – Mozibur Ullah Jan 18 '18 at 12:10
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1More on significant figures. – Qmechanic Jan 18 '18 at 12:39