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International System of Units (SI)
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International System of Units (SI)
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This page describes additional standards, references, and guides published by various standards organizations that provide “official” information about the use of SI, the International System of Units. (We assume you have already read the the main reference publications page.)
Some of the publications described on this page are rather expensive; others cover specialized areas. As a result, they're worth knowing about but are less likely to be of general interest. And note that there are hundreds of metric-related standards; here we list only a few.
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.
This notice from NIST, published in the 16 May 2008 Federal Register, announces that two NIST Special Publications—SP 330 and SP 811—serve as the U.S. interpretation of SI, and refers the reader to them.
Technically speaking, this document answers the question, Where is the legal announcement of the U.S. interpretation of SI? Read the Federal Register notice for details, but note that it does not contain the interpretation; rather, it is a cross reference to the aforementioned publications, listed on our main SI publications page, which provide the actual interpretation.
The parts of the ISO 80000 series of standards describe various quantities and units; in general, they replace corresponding parts of the older ISO 31 series.
ISO 80000-1:2009 Quantities and units - Part 1: General gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities, ISQ, and the International System of Units, SI. It is available from ANSI for $172. See also ISO 80000-1/Cor1:2011.
ISO 80000-2:2009 Quantities and units - Part 2: Mathematical signs and symbols to be used in the natural sciences and technology gives general information about mathematical signs and symbols, their meanings, verbal equivalents and applications. It is available from ANSI for $164.
ISO 80000-3:2006 Quantities and units — Part 3: Space and time gives names, symbols and definitions for quantities and units of space and time. It is available from ANSI for $120.
ISO 80000-4:2006 Quantities and units — Part 4: Mechanics specifies the names, symbols and definitions for quantities and units of classical mechanics. It is available from ANSI for $135.
ISO 80000-5:2007 Quantities and units — Part 5: Thermodynamics gives names, symbols and definitions for quantities and units of thermodynamics. It is available from ANSI for $126.
ISO 80000-7:2008 Quantities and units - Part 7: Light gives names, symbols and definitions for quantities and units for light and other electromagnetic radiation. It is available from ANSI for $172.
ISO 80000-8:2007 Quantities and units — Part 8: Acoustics gives names, symbols, and definitions for quantities and units of acoustics. It is available from ANSI for $98.
ISO 80000-9:2009 Quantities and units - Part 9: Physical chemistry and molecular physics gives names, symbols, and definitions for quantities and units of physical chemistry and molecular physics. It is available from ANSI for $164. See also ISO 80000-9/Amd1:2011.
ISO 80000-10:2009 Quantities and units - Part 10: Atomic and nuclear physics gives the names, symbols, and definitions for quantities and units used in atomic and nuclear physics. It is available from ANSI for $204.
ISO 80000-11:2008 Quantities and units - Part 11: Characteristic numbers gives the names, symbols and definitions for characteristic numbers used in the description of transport phenomena. It is available from ANSI for $80.
ISO 80000-12:2009 Quantities and units - Part 12: Solid state physics gives names, symbols and definitions for quantities and units of solid state physics. It is available from ANSI for $142.
This 2001 standard is available for $60 from ANSI or from the American Welding Society.
This 96-page Canadian standard is available from the Canadian Standards Association for C$79 electronically or for C$100 as hardcopy.
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Updated: 2012-05-03