Definition:SI Units
Contents
Definition
The SI Units are the elements of the International System of Units.
SI Base Units
| Name | Unit symbol | Dimension | Symbol |
|---|---|---|---|
| metre | $\mathrm m$ | Length | $l$ |
| kilogram | $\mathrm {kg}$ | Mass | $m$ |
| second | $\mathrm s$ | Time | $t$ |
| ampere | $\mathrm A$ | Electric Current | $I$ |
| kelvin | $\mathrm K$ | Temperature | $T$ |
| candela | $\mathrm {cd}$ | Luminous Intensity | $I_v$ |
| mole | $\mathrm {mol}$ | Amount of Substance | $n$ |
SI Derived Units
The units derived from the SI base units include the following:
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Also see
Historical Note
The SI units originated in the work done by Joseph Louis Lagrange to establish a decimal system for weights and measures.
Linguistic Note
The abbreviation SI in the term SI units is from the French Le Système International d'Unités (the International System of Units).
