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IEVref: | 112-01-32 | ID: | |

Language: | en | Status: 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 Examples: - J := kg m
^{2}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.
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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: | |||

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Domain5: |

NOTE For the quantities *Q*_{1}, *Q*_{2}, and *Q*_{3} related by the quantity equation *Q*_{1} = *ζ* *Q*_{2} *Q*_{3}, the unit equation is [*Q*_{1}] = [*Q*_{2}] [*Q*_{3}], where [*Q*_{1}], [*Q*_{2}], and [*Q*_{3}] denote the units of *Q*_{1}, *Q*_{2}, and *Q*_{3}, respectively, provided that these units are in a coherent system of units.

Examples:

- J := kg m
^{2}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.