3 Units, Constants, and Conversion Factors

Revised byEugene A. Mechtly


There are two classes of units in the International System of Units (SI): base units and derived units. The units of these two classes form a coherent set of units. This coherent set of units is designated by the name “SI Units.”

SI Base Units

The SI is founded on seven base units, respectively, for seven base quantities. The base quantities are assumed to be mutually ...

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