International System of Quantities

The International System of Quantities (ISQ) is a standard system of quantities used in physics and in modern science in general. It includes basic quantities such as length and mass and the relationships between those quantities.^[a] This system underlies the International System of Units (SI)^[b] but does not itself determine the units of measurement used for the quantities.

The system is formally described in a multi-part ISO standard ISO/IEC 80000 (which also defines many other quantities used in science and technology), first completed in 2009 and subsequently revised and expanded.

^ ISO 80000-1:2009 Quantities and units. Part 1: General (1st ed.), Switzerland: ISO (the International Organization for Standardization), 2009-11-15, p. vi, retrieved 23 May 2015
^ NIST Special Publication 330 – 2008 edition, p. 10

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[ISO_80000-1:2009-1] ISO 80000-1:2009 Quantities and units. Part 1: General (1st ed.), Switzerland: ISO (the International Organization for Standardization), 2009-11-15, p. vi, retrieved 23 May 2015

[3] NIST Special Publication 330 – 2008 edition, p. 10

[a]

[b]