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| articles:nist_traceability [2019/05/19 11:25] – [What are SI Units?] rrandall | articles:nist_traceability [2019/05/19 11:36] – [What are SI Units?] rrandall |
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| SI Units are also explained on the NIST web site at: https://www.nist.gov/pml/weights-and-measures/metric-si/si-units | SI Units are also explained on the NIST web site at: https://www.nist.gov/pml/weights-and-measures/metric-si/si-units |
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| And, alternatively, are presented in "[[https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication330e2008.pdf|NIST Special Publication 330 - The International System of Units (SI)]]" (which will likely be updated after May 20, 2019). | Alternatively, SI Units are also discussed in "[[https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication330e2008.pdf|NIST Special Publication 330 - The International System of Units (SI)]]" (which will likely be updated after May 20, 2019 when a significant update to the SI goes into effect). |
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| Because SI units are derived from intrinsic (i.e., invariant) constants of nature, "intrinsic measurement standards" exist. This is acknowledged in ISO 17025:2017, sec. 6.5.2, which provides 3 (three) different methodologies for achieving metrological traceability. And is further clarified in ISO 17025:2017, "Annex A: Metrological traceability". \\ | Because SI units are derived from intrinsic (i.e., invariant) constants of nature, "intrinsic measurement standards" exist. This is acknowledged in ISO 17025:2017, sec. 6.5.2, which provides 3 (three) different methodologies for achieving metrological traceability. And is further clarified in ISO 17025:2017, "Annex A: Metrological traceability". \\ |
