# Fundamental units

Several system of units have been used for describing measurements of the various physical quantities. Each system is named in terms of its fundamental units.

It is a metric system because multiples and sub-multiples of fundamental units are obtained in "power of ten" of the corresponding fundamental unit.

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**1) CGS System****It is known as Gaussian system and is based on 'centimeter', 'gram',and 'second' as fundamental units of length, mass and time respectively.**

It is a metric system because multiples and sub-multiples of fundamental units are obtained in "power of ten" of the corresponding fundamental unit.

**2) FPS System****It is the British system which uses foot, pound, and second as fundamental units of length, mass and time respectively. It is not a metric system and is rarely used.**

**3) MKS System****It uses metre, kilogram, and second as fundamental units of length, mass and time respectively. It is also a metric system.**

**4) SI (Systeme International d Unites)****The system was internationally accepted in 1960. SI is the abbreviation of 'Systeme International d' unites, which is French equivalent of International System Of Units.**

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