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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.
That means that the volume reading 25.3 Â± 0.1 mL is correct. When a calculation is done with this volume the uncertainty is converted to a percentage uncertainty. The scientist understands that every measurement has some uncertainty in it and this uncertainty is contained in any answer.n science, uncertainty refers to the precision of your measurements. No matter what instrument you use the last figure you write down is the figure with the uncertainty.