ISO 31

Appearance move to sidebar hide

ISO 31 (Quantities and units, International Organization for Standardization, 1992) is a superseded international standard concerning physical quantities, units of measurement, their interrelationships and their presentation. It was revised and replaced by ISO/IEC 80000.


The standard comes in 14 parts:

A second international standard on quantities and units was IEC 60027. The ISO 31 and IEC 60027 Standards were revised by the two standardization organizations in collaboration (, ) to integrate both standards into a joint standard ISO/IEC 80000 - Quantities and Units in which the quantities and equations used with SI are to be referred as the International System of Quantities (ISQ). ISO/IEC 80000 supersedes both ISO 31 and part of IEC 60027.

Coined words

ISO 31-0 introduced several new words into the English language that are direct spelling-calques from the French. Some of these words have been used in scientific literature.

New phrase Existing phrase Technical meaning
massic <quantity> specific <quantity> a quantity divided by its associated mass
volumic <quantity> <quantity> density a quantity divided by its associated volume
areic <quantity> surface <quantity> density a quantity divided by its associated area
lineic <quantity> linear <quantity> density a quantity divided by its associated length

Related national standards

See also


  1. ^ "ISO 31-0:1992 Quantities and units — Part 0: General principles". International Organization for Standardization. Retrieved 8 May 2021.
  2. ^ Tolga, G. O. K. (2016). The importance of symbols and units in natural science. The Eurasia Proceedings of Educational and Social Sciences, 4, 165-167.
  3. ^ NIST SP811(§8.9)
  4. ^ Mills, I. (1993). Quantities, units and symbols in physical chemistry/prepared for publication by Ian Mills.... Oxford; Boston: Blackwell Science; Boca Raton, Fla.: CRC Press .
  5. ^ Taylor, B. (1995). Guide for the use of the International System of Units (SI): the metric system. DIANE Publishing.
  6. ^ Dietrich, P. M.; Streeck, C.; Glamsch, S.; Ehlert, C.; Lippitz, A.; Nutsch, A.; Beckhoff, B.; W. E. S., Unger (2015). "Quantification of silane molecules on oxidized silicon: are there options for a traceable and absolute determination?". Analytical Chemistry. 87 (19): 10117–10124. doi:10.1021/acs.analchem.5b02846. PMID 26334589.
  7. ^ Sertlek, H. Ö.; Slabbekoorn, H.; Ten Cate, C.; Ainslie, M. A. (2019). "Source specific sound mapping: Spatial, temporal and spectral distribution of sound in the Dutch North Sea". Environmental Pollution. 247: 1143–1157. doi:10.1016/j.envpol.2019.01.119. PMID 30823343.


External links