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Note In the meantime, users may refer to the Bureau International des Poids et Mesures (BIPM) website. Now that the 9th edition of the SI Brochure (2019) has been made available, we are in the process of revising SP 330, SP 811, and the contents of this site. Essentials of the SI Introduction SI units and prefixes Units outside the SI Rules and style conventions Background Bibliography
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