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SI derived unit

SI derived units are units of measurement derived from the seven SI base units specified by the International System of Units (SI). They can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation. Some are dimensionless, as when the units cancel out in ratios of like quantities. SI coherent derived units involve only a trivial proportionality factor, not requiring conversion factors.

Special names
The International System of Units assigns special names to 22 derived units, which includes two dimensionless units, the radian (rad) and the steradian (sr). ==By field of application==
By field of application
Kinematics Mechanics Chemistry Electromagnetics Photometry Thermodynamics ==Other units used with SI==
Other units used with SI
Some other units such as the hour, litre, tonne, bar, and electronvolt are not SI units, but are widely used in conjunction with SI units. ==Supplementary units==
Supplementary units{{anchor|SI supplementary unit}}
Until 1995, the SI classified the radian and the steradian as supplementary units, but this designation was abandoned and the units were grouped as derived units. ==See also==
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