SI base unit

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The SI base units are:

Physical quantitySymbolName of SI base unitSymbol for SI unit
electric currentIampereA
thermodynamic temperatureTkelvinK
amount of substancenmolemol
luminous intensityIvcandelacd

All other physical units can be derived from these seven SI base units.

The SI prefixes are applied to abbreviate long numbers.

To do: merge Standards and Units with this. Incorporate operational definitions of units.