The US edition of the SI Brochure reflecting the 2019 redefinition in which all seven base units derive from fixed defining constants. Freely available…
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SP 330 — International System of Units
NIST Special Publication 330 The International System of Units (SI) 2019 EDITION SP 330 David B. Newell and Eite Tiesinga, Editors This publication is…
…traceability statements now terminate in constants of nature, and NIST SP 330:2019 is the reference for how to phrase that in US practice.