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Relative Uncertainty (Relative Error). Relative uncertainty is the ratio of the absolute uncertainty of a measurement to the best estimate. It expresses the relative size of the uncertainty of a measurement (its precision).Symbolically, if is the absolute uncertainty in a measurement. , then the relative uncertainty in x, s x, is:n uncertainty interval (or error interval) is the   part of a measurement. 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.
Typically, the uncertainty is small compared to the measured value, so it is convenient to multiply the. fractional uncertainty by 100 and report the percent uncertainty. Percent Uncertainty = Fractional Uncertainty Ã 100 (3) If multiple trials are performed to measure X, the best estimate is the average value,