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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.
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.