Definition:SI Units/Base Units

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The base SI units are as follows:

SI Base Units
Name Unit symbol Dimension Symbol
metre $\mathrm m$ $\mathsf L$: Length $l$
kilogram $\mathrm {kg}$ $\mathsf M$: Mass $m$
second $\mathrm s$ $\mathsf T$: Time $t$
ampere $\mathrm A$ $\mathsf I$: Electric Current $I$
kelvin $\mathrm K$ $\Theta$: Temperature $T$
candela $\mathrm {cd}$ $\mathsf J$: Luminous Intensity $I_v$
mole $\mathrm {mol}$ $\mathsf N$: Amount of Substance $n$

Also see