Base unit

Measurement unit that is adopted by convention for a base quantity.

Example:  

The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived. These SI base units and their physical quantities are:

  • metre (m) for length
  • kilogram (kg) for mass
  • second (s) for time
  • ampere (A) for electric current
  • kelvin (K) for temperature
  • candela (cd) for luminous intensity
  • mole (mol) for the amount of substance.

http://en.wikipedia.org/wiki/SI_base_unit
The seven SI base units and the interdependency of their definitions


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