Question

reference for system and units

Answer 1

International System of Units (SI) reference publications

The following standards, references, and guides published by various standards organizations provide “official” information about SI, the International System of Units.

To order copies of these publications, use the links provided herein; these publications are not available directly from USMA unless otherwise noted. Prices are, of course, subject to change; visit the vendors for current prices. To discover the meaning of any unrecognized acronyms, try USMA’s glossary of metric acronyms.

SI Brochure, 8th edition, 2006 —
The International System of Units (SI), aka Le Système international d’unités (SI)

“Since 1970, the Bureau International des Poids et Mesures, the BIPM (known in English as the International Bureau of Weights and Measures), has published seven previous editions of this document. Its main purpose is to define and promote the SI, which has been used around the world as the preferred language of science and technology since its adoption in 1948 through a Resolution of the 9th Conférence Générale des Poids et Mesures, the CGPM (known in English as the General Conference on Weights and Measures).”

This standard is available from BIPM, which has free downloadable copies of the full, 186-page French and English version; the 88-page English half; a 4-page concise summary; and a foldable pocket version; as well as a version for browsing online.