ISO 31 (Quantities and units, International Organization for Standardization, 1992) is a superseded international standard concerning physical quantities, units of measurement, their interrrelationships and their presentation.[1] It was revised and replaced by ISO/IEC 80000.

Parts

The standard comes in 14 parts:

A second international standard on quantities and units was IEC 60027[citation needed]. The ISO 31 and IEC 60027 Standards were revised by the two standardization organizations in collaboration ([1], [2]) 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.[2] Some of these words have been used in scientific literature.[3][4]

New phrase Existing phrase Technical meaning
massic <quantity> specific <quantity> a quantity divided by its associated mass
volumic <quantity> [volumic] <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

Notes

  1. ^ "ISO 31-0:1992 Quantities and units — Part 0: General principles". International Organization for Standardization. Retrieved 8 May 2021.
  2. ^ NIST SP811(§8.9)
  3. ^ Mills, I. (1993). Quantities, units and symbols in physical chemistry/prepared for publication by Ian Mills...[et al.]. Oxford; Boston: Blackwell Science; Boca Raton, Fla.: CRC Press [distributor].
  4. ^ Taylor, B. (1995). Guide for the use of the International System of Units (SI): the metric system. DIANE Publishing.

References