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| [[File:SI.png]] | | [[File:SI.png]] |
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| =Wiki=
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| {| class=infobox style="width: 400px;"
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| |colspan=3 style="text-align: center;vertical-align: middle;" | '''SI Base Units'''
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| |style="text-align: center;vertical-align: middle;" | '''Symbol''' || style="text-align: center;vertical-align: middle;" | '''Name''' || style="text-align: center;vertical-align: middle;" | '''Quantity'''
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| |style="text-align: center;vertical-align: middle;" | s || style="text-align: center;vertical-align: middle;" | [[second]] || style="text-align: center;vertical-align: middle;" | [[time]]
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| | style="text-align: center;vertical-align: middle;" | m || style="text-align: center;vertical-align: middle;" | [[metre]] || style="text-align: center;vertical-align: middle;" | [[length]]
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| | style="text-align: center;vertical-align: middle;" | kg || style="text-align: center;vertical-align: middle;" | [[kilogram]] || style="text-align: center;vertical-align: middle;" | [[mass]]
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| | style="text-align: center;vertical-align: middle;" | A || style="text-align: center;vertical-align: middle;" | [[ampere]] || style="text-align: center;vertical-align: middle;" | [[electric current]]
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| | style="text-align: center;vertical-align: middle;" | K || style="text-align: center;vertical-align: middle;"| [[kelvin]] ||style="text-align: center;vertical-align: middle;" | [[thermodynamic temperature]]
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| | style="text-align: center;vertical-align: middle;" | mol || style="text-align: center;vertical-align: middle;" | [[mole (unit)|mole]] || style="text-align: center;vertical-align: middle;" | [[amount of substance]]
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| | style="text-align: center;vertical-align: middle;" | cd || style="text-align: center;vertical-align: middle;" | [[candela]]|| style="text-align: center;vertical-align: middle;" | [[luminous intensity]]
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| |colspan=3 style="text-align: center;vertical-align: middle;" | '''SI Defining Constants'''
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| | style="text-align: center;vertical-align: middle;" | '''Symbol''' || style="text-align: center;vertical-align: middle;" | '''Name''' || style="text-align: center;vertical-align: middle;" | '''Exact Value'''
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| | style="text-align: center;vertical-align: middle;" | <math>\Delta\nu_\text{Cs}</math> || style="text-align: center;vertical-align: middle;" | [[Caesium standard|hyperfine transition frequency of Cs]] || style="text-align: center;vertical-align: middle;" | {{val|9192631770|u=Hz}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''c''}} || style="text-align: center;vertical-align: middle;" | [[speed of light]] || style="text-align: center;vertical-align: middle;" | {{val|299792458|u=m/s}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''h''}} || style="text-align: center;vertical-align: middle;" | [[Planck constant]] || style="text-align: center;vertical-align: middle;" | {{val|6.62607015e-34|u=J.s}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''e''}} || style="text-align: center;vertical-align: middle;" | [[elementary charge]] || style="text-align: center;vertical-align: middle;" | {{val|1.602176634e-19|u=C}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''k''}} || style="text-align: center;vertical-align: middle;" | [[Boltzmann constant]] || style="text-align: center;vertical-align: middle;" | {{val|1.380649e-23|u=J/K}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''N''}}<sub>A</sub> || style="text-align: center;vertical-align: middle;" | [[Avogadro constant]] ||style="text-align: center;vertical-align: middle;" | {{val|6.02214076e23|u=mol-1}}
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| | style="text-align: center;vertical-align: middle;" | {{Math|''K''<sub>cd</sub>}} || style="text-align: center;vertical-align: middle;" | [[luminous efficacy]] of {{val|540|u=THz}} radiation || style="text-align: center;vertical-align: middle;" | {{val|683|u=lm/W}}
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| |}
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