Chemistry / Chem 0125 · Atom · ~20 seconds
Significant Figures Defined
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Significant figures are all digits in a measurement known with certainty, plus one final estimated digit.
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Reading a graduated cylinder as 21.6 mL treats the 2 and 1 as certain and the 6 as the estimated, uncertain digit.
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More digits do not mean more precision — writing 21.60 implies a more precise instrument than the one that gave 21.6.