When you measure something, you need to also consider and express how confident you are in its correctness.

A measurement result is complete only when accompanied by a quantitative statement of its uncertainty. The uncertainty is required in order to decide if the result is adequate for its intended purpose and to ascertain if it is consistent with other similar results.

more to come but in the meantime check out detailed information on this important concept:
http://www.measurementuncertainty.org/

 

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