Every measurement involves errors. Thus, the result of measurement should be reported in a way that indicates the precision of measurement. Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus the first digit that is uncertain. The reliable digits plus the first uncertain digit are known as significant digits or significant figures.

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CASE_STUDIESSignificant Figures in MeasurementRules for Counting Significant FiguresDetermining Uncertainty in Results5 sub-questions