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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 ...
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).
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10:40, 22 February 2020: 600 × 600 (15 KB) The Anome: no, unit positions are consistent with other diagrams, and metre, second and kilogram are at the top because of inter-unit dependencies: 16:36, 20 February 2020: 600 × 600 (7 KB) Randomwangran: direction is wrong: 12:17, 19 February 2020: 600 × 600 (15 KB) The Anome
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]
A unit multiple (or multiple of a unit) is an integer multiple of a given unit; likewise a unit submultiple (or submultiple of a unit) is a submultiple or a unit fraction of a given unit. [1] Unit prefixes are common base-10 or base-2 powers multiples and submultiples of units. While a base unit is one that has been explicitly so designated, [2 ...