NIST has issued a new American version of the English language SI Brochure, the eight edition of the international standard reference guide to the metric system. The SI plays an essential role in trade and commerce and is the common language of scientific and technological research and development.
The 2008 edition of NIST Special Publications (SP) 330, the International System of Units (SI), cover correct U.S. usage of metric units. In another update, NIST SP 811, Guide for the Use of the International System of Units (SI), complements SP 330, and is published to assist NIST authors and others in correct SI usage and unit conversion. An extensive conversion factor appendix offers help in measurement unit conversions and in appropriate rounding-off of data. SP 811 also provides an editorial checklist for reviewing manuscripts' conformity with the SI and the basic principles of physical quantities and units. A color diagram has been added that illustrates the utilization of the SI base units in defining the 22 derived units with special names and symbols.
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