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**Physics, Astronomy & Cosmology / Re: How are physical units defined?**

« **on:**03/08/2022 17:49:47 »

counting their paces and then multiplied the number of paces by the length of their stride they would disagree on the length of the perimeterSurely the disagreement would be of the order of (the uncertainly of stride length multiplied by the number of paces) plus (one average stride multiplied by the uncertainty of counting) for each participant. You can take the root sum of squares for your best prior estimate of the limit of disagreement.