= Weighing by Double Substitution by National Institute of Standards and Technology
{c}
{tag=Work by National Institute of Standards and Technology}
{title2=SOP4–2019}
https://www.nist.gov/system/files/documents/2019/05/13/sop-4-double-substitution-20190506.pdf
Recommended Standard Operating Procedure for Weighing by Double Substitution, SOP4,2019, part of NISTIR6969–2019. Corporate primary publication; no individual authorship inferred. Precise locators: p1, Purpose, comparison twice with a known standard and response calibration using a sensitivity mass; pp6–8, actual sequences/observation instructions; §3 and uncertainty section, buoyancy and density contributions. The article's separate equally spaced four-reading cancellation example is an original simplified model, not a transcription of this full procedure.
Additional locators in the 2019 SOP4: https://www.nist.gov/system/files/documents/2019/05/13/sop-4-double-substitution-20190506.pdf[p. 3, Summary, sensitivity addition during the latter two observations; p. 7, Table 5, loads S, X, X+sw and S+sw; p. 8, observations 2.5.2.1–2.5.2.6; pp. 9–10, calculations and buoyancy treatment].
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