– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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SI Brochure: The International System of Units (SI)

We are pleased to present the 9th edition of the SI Brochure (2019), which defines and presents the Système International d'Unités, the SI (known in English as the International System of Units).

Detailed information for translators and editors on changes to versions of the text made since May 2019 are available on request to the BIPM Webmaster .

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NOTE: This work is licensed under a Creative Commons Attribution 4.0 International License.