ISO 31

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International Standard ISO 31 (Quantities and units, International Organization for Standardization, 1992) is the most widely respected style guide for the use of physical quantities and units of measurement, and formulas involving them, in scientific and educational documents worldwide. In most countries, the notations used in mathematics and science textbooks at schools and universities follow closely the guidelines given by ISO 31.

Contents

[edit] Parts

The standard comes in 14 parts:

ISO 31-0: General principles
ISO 31-1: Space and time
ISO 31-2: Periodic and related phenomena
ISO 31-3: Mechanics
ISO 31-4: Heat
ISO 31-5: Electricity and magnetism
ISO 31-6: Light and related electromagnetic radiations
ISO 31-7: Acoustics
ISO 31-8: Physical chemistry and molecular physics
ISO 31-9: Atomic and nuclear physics
ISO 31-10: Nuclear reactions and ionizing radiations
ISO 31-11: Mathematical signs and symbols for use in the physical sciences and technology
ISO 31-12: Characteristic numbers
ISO 31-13: Solid state physics

A second international standard on quantities and units is IEC 60027. The ISO 31 and IEC 60027 Standards are at present being revised by the two standardization organizations in collaboration [1][2]. The revised harmonized standard will be known as ISO/IEC 80000, Quantities and units.

[edit] Related national standards

  • Canada: CAN/CSA-Z234-1-89 Canadian Metric Practice Guide (covers some aspects of ISO 31-0, but is not a comprehensive list of physical quantities comparable to ISO 31)
  • United States: There are several national SI guidance documents, such as NIST SP 811, NIST SP 330, NIST SP 814, IEEE/ASTM SI 10, SAE J916. These cover many aspects of the ISO 31-0 standard, but lack the comprehensive list of quantities and units defined in the remaining parts of ISO 31.

[edit] See also

  • SI – the international system of units
  • BIPM – publishes freely available information on SI units [3], which overlaps with some of the material covered in ISO 31-0
  • IUPAP – much of the material in ISO 31 comes originally from Document IUPAP-25 of the Commission for Symbols, Units and Nomenclature (SUN Commission) [4] of the International Union of Pure and Applied Physics
  • IUPAC – some of the material in ISO 31 originates from the Interdivisional Committee on Terminology, Nomenclature and Symbols [5] of the International Union of Pure and Applied Chemistry
  • Quantities, Units and Symbols in Physical Chemistry – this IUPAC "Green Book" covers many ISO 31 definitions
  • IEC 60027 Letter symbols to be used in electrical technology
  • ISO 1000 SI Units and Recommendations for the use of their multiples and of certain other units (bundled with ISO 31 as the ISO Standards Handbook – Quantities and units)

[edit] External links

[edit] References

de:ISO 31 fr:ISO 31 hu:ISO 31 nl:ISO 31 no:ISO 31 pt:ISO 31 sv:ISO 31

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