International System of Quantities

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The International System of Quantities is a system based on seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance and luminous intensity. Other quantities such as area, pressure and electrical resistance are derived from these base quantities by clear non-contradictory equations. The International System of Units (SI) is based on the International System of Quantities (ISQ) in that the ISQ defines the quantities which are measured with the SI units.[1] The ISQ is defined in the international standard ISO/IEC 80000.[2]


  1. ^ "1.16". International vocabulary of metrology – Basic and general concepts and associated terms (VIM) (3rd ed.). International Bureau of Weights and Measures (BIPM):Joint Committee for Guides in Metrology. 2012. Retrieved 28 March 2015. 
  2. ^ S. V. Gupta, Units of Measurement: Past, Present and Future. International System of Units, p. 16, Springer, 2009 ISBN 3642007384.

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