IEVref: 112-01-32 ID: Language: en Status: Standard Term: unit equation Synonym1: Synonym2: Synonym3: Symbol: 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 Replaces: Internal notes: 2015-05-07: Image-based entry replaced by character-based entry. JGO CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: