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IEVref:112-01-32ID:
Language:enStatus: Standard
Term: unit equation
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Definition: mathematical relation between base units, coherent derived units or other units of measurement

NOTE For the quantities Q1, Q2, and Q3 related by the quantity equation Q1 = ζ Q2 Q3, the unit equation is [Q1] = [Q2] [Q3], where [Q1], [Q2], and [Q3] denote the units of Q1, Q2, and Q3, respectively, provided that these units are in a coherent system of units.

Examples:

  • J := kg m2 s−2, where J, kg, m, and s are the symbols for the joule, kilogram, metre, and second, respectively (the symbol := denotes “is by definition equal to”);
  • 1 km/h = (1/3,6) m/s.



Publication date:2010-01
Source:ISO/IEC GUIDE 99:2007 1.23 MOD
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Internal notes:2015-05-07: Image-based entry replaced by character-based entry. JGO
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