Fundamental units

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The fundamental units are the units of the fundamental quantities, as defined by the International System of Units. They are not dependent upon any other units, and all other units are derived from them. In the International System of Units, the fundamental units are:


  1. The meter (symbol: m), used to measure length.
  2. The kilogram (symbol: kg), used to measure mass.
  3. The second (symbol: s), used to measure time.
  4. The ampere (symbol: A), used to measure electric current.
  5. The kelvin (symbol: K), used to measure temperature.
  6. The mole (symbol: mol), used to measure amount of substance or particles in matter.
  7. The candela (symbol: cd), used to measure light intensity.