Most of the names are just combinations of base units, but there are 22 derived units with special names. The symbols for units named for persons begin with an uppercase letter. For example, the watt, hertz, and coulomb are derived units named for people. Their symbols are W, Hz, and C, respectively. There are 22 derived units with special names, including the dimensionless derived units the radian rad and steradian sr.
However, there are over other derived units that are expressed in terms of their base units. Table 4. Return to Units home page. Units Topics:. Units Bibliography.
SI base units The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1. SI base units. Examples of SI derived units.
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