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It is used, along with significant digits, to indicate the precision of a measurement. Thus, in the two-significant-digit measurement 5.4 0.2 meters, the uncertainty interval is 0.2 meters. This means that the true value of the measurement is believed to lie between 5.2 meters and 5.6 meters.
Uncertainty Analysis Figures from Theory and Design for Mechanical Measurements; Figliola, Third Edition Uncertainty Analysis Error = difference between true value and observed Uncertainty = we are estimating the probable error, giving us an interval about the measured value in which we believe the true value must fall. Uncertainty Analysis = process of identifying and qualifying errors. Measurement Errors Two General Groups