There are 7 basic units which are dimensionally independent and two supplementary units. These are:
Metre (length)
Kilogram (mass)
Second (time)
Ampere (electric current)
Kelvin (thermodynamic temperature)
Mole (amount of substance)
Candela (luminous intensity)
The two supplementary units are the radian and steradian which are measures of angles in 2 and 3 dimensional space (respectively).
Additionally, there are many other units that can be derived from these and basically, if anyone wants to measure a physical or chemical characteristic, there is probably a metric unit for it.
Examples:
Pascal, Joule, Watt, Newton, Tesla, Henry, Coulomb, Volt, Farad, Siemens, Weber, Ohm, Lux, Lumen, Becquerel, Gray, Sievert, Hertz, Katal.
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