Chemistry / Chem 0121 · Atom · ~20 seconds
Exact Numbers vs. Measured Numbers
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An exact number, from counting or a definition, carries no uncertainty; a measured number always carries uncertainty.
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Counting twelve eggs in a carton gives an exact number; weighing those eggs on a scale gives a measured, uncertain number.
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A defined conversion, like twelve inches to a foot, never limits how many significant figures a calculation keeps.