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[[Category:SI unit templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:SI unit templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
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The SI system after 1983, but before the 2019 revision: Dependence of base unit definitions on other base units (for example, the metre is defined as the distance travelled by light in a specific fraction of a second), with the constants of nature and artefacts used to define them (such as the mass of the IPK for the kilogram).
English: Illustration of the SI system of units, with base units and defining constants used to define them: s - the frequency of the caesium transition for the second, kg - the mass of the IPK for the kilogram, mol - the mass in kilograms of an atom of carbon 12 for the mole, cd - the sensitivity of the human eye for the candela,
For example, the coherent derived SI unit of velocity is the metre per second, with the symbol m/s. [1]: 139 The base and coherent derived units of the SI together form a coherent system of units (the set of coherent SI units). A useful property of a coherent system is that when the numerical values of physical quantities are expressed in terms ...
English: The kelvin (K) is now fixed in terms of the Boltzmann constant (kB) and the joule. The joule is not shown because it is a derived unit defined by the meter (m), second (s), and kilogram (kg), which themselves are defined by the speed of light (c), the duration of the caesium-133 ground-state hyperfine transition (ΔνCs), and the Planck constant (h), respectively.
The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units. [2]
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