SI derived units are part of the
SI system of measurement
units and are derived from the seven
SI base units.
Dimensionless derived units
The following SI units are actually dimensionless ratios, formed by dividing two identical SI units. They are therefore considered by the
BIPM to be derived. Formally, their SI unit is simply the number 1, but they're given these special names, for use whenever the lack of a unit might be confusing.
Derived units with special names
Base units can be put together to derive units of measurement for other quantities. In addition to the two dimensionless derived units
rad and
sr there are 20 derived units having special names:
Other quantities and units
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