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What is the formula for the SI unit?
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The International System of Units (SI) does not have a single all-encompassing formula. Instead, it defines a set of base units from which all other SI units are derived.
There are seven SI base units, each with a specific symbol and physical quantity:
- Meter (m): unit of length
- Kilogram (kg): unit of mass
- Second (s): unit of time
- Ampere (A): unit of electric current
- Kelvin (K): unit of thermodynamic temperature
- Mole (mol): unit of amount of substance
- Candela (cd): unit of luminous intensity
Derived units are formed by combining these base units through multiplication or division. For example, the unit for speed is meters per second (m/s), derived from the base units of length (meter) and time (second). The formulas used to derive SI units are based on the physical relationships between the quantities they represent.
For further information, refer to the official SI brochure published by the BIPM: