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I do not understand what the accuracy of $1$ part in $10^{14}$ means. [...] reviewed the definitions of accuracy and error [...] In definitions of "accuracy" or "error" you should have noticed mentioning of the true value of some particular quantity, referring to the trial(s) under consideration, and the corresponding, commensurate value(s), ...


out context, you can't state. But , if it is used with a class of numbers ending with 2 zeros, in most cases, it implies it has only 3 significant digits. Counterexample: a list of last years of the 29th century ( 5 significant digits )


It have 5 significant figures, as the zeros are present on right hand side of a numbers .

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