Wikipedia: SI unit

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Unit according to the International System of Units SI. There are the seven SI base units and the derived SI units. Non-SI units can be converted to SI units (or vice verca) according to the conversion of units.

A SI unit is a unit of measurement according to the International System of Units SI. There are seven base units and several derived units. Non-SI units can be converted to SI units (or vice versa) according to the conversion of units.