Guide For The Use Of The International System Of Units Si Rev

A guide to assist users of the metric system (Internat. System of Units; SI), to inform them of changes in the SI and in SI usage. Contents: (1) Intro.; (2) NIST Policy on the Use of the SI; (3) Other Sources of Info. on the SI; (4) The Two Classes of SI Units and the SI Prefixes; (5) Units Outside the SI; (6) Rules and Style Conventions for Printing and Using Units; (7) Rules and Style Conventions for Expressing Values of Quantities; (8) Comments on Some Quantities and Their Units; (9) Rules and Style Conventions for Spelling Unit Names; (10) More on Printing and Using Symbols and Numbers in Scientific and Technical Documents; Appendix A: Definitions of the SI Base Units; Appendix B: Conversion Factors. Illustrations.

Provides assistance in the use of the International System of Units, including the reporting of results of measurements. The International System of Units is the modern metric system of measurement used throughout the world.

The International System of Units, universally abbreviated SI, is the modern metric system of measurement. Long the dominant system used in science, the SI is rapidly becoming the dominant measurement system used in international commerce. The definitive international reference on the SI is a document published by the International Bureau of Weights and Measures and often referred to as the SI document. It is in French followed by a text in English. This 2008 edition is the U.S. version of the English text of the 8th (most current) edition of the document. Illustrations.

A basic introduction to the metric system. Covers: the three classes of SI units & the SI prefixes; units outside the SI; rules & style conventions for printing & using units; rules & style conventions for expressing values of quantities; comments on some quantities & their units; rules & style conventions for spelling unit names; printing & using symbols & numbers in scientific & technical documents; & check list for reviewing manuscripts. Appendix: definitions of SI base units & the radian & Steradian; conversion factors, & comments on the references of the SI for the U.S. Extensive bibliography.

Results of measurements and conclusions derived from them constitute much of the technical information produced by the National Institute of Standards and Technology (NIST). In July 1992 the Director of NIST appointed an Ad Hoc Committee on Uncertainty Statements and charged it with recommending a policy on this important topic. The Committee concluded that the CIPM approach could be used to provide quantitative expression of measurement that would satisfy NIST¿s customers¿ requirements. NIST initially published a Technical Note on this issue in Jan. 1993. This 1994 edition addresses the most important questions raised by recipients concerning some of the points it addressed and some it did not. Illustrations.

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