In this note, we are going to know about a topic called “**What is System of Unit in Physics?**“, and **types of system of unit in physics**. Welcome to **Poly Notes Hub**, a leading destination for **engineering notes** for diploma and degree engineering students.

Author Name: **Arun Paul**.

## What is System of Unit in Physics?

A complete set of **units**, both fundamental and derived for all kinds of **physical quantities** is called system of units.

## Types of System of Unit in Physics

**There are four types of system –**

**CGS system or Gaussian System:**In this system the**fundamental quantities**are length, mass, and time and their respective units are taken as centimeters (cm), grams (g), and second (s).**FPS System:**In this system length, mass, and time are taken as**fundamental quantities**and their base units are foot (ft) pound (lb)and second (s) respectively.**MKS System:**It uses meter, kilogram, and second as the fundamental units of length, mass, and time respectively.**SI units Or International System Of Units:**The system of units, which is accepted internationally for measurement is the international system of**units**, abbreviated as SI, and is the modern form of metric system finally agreed upon at the**eleventh International Conference of weights and measures**, 1960.

## Fundamental Quantities and Their Units

**Below we have listed some basic or fundamental quantities and their SI Unit –**

Fundamental Quantities | SI Unit | Symbol |
---|---|---|

1. Length | metre | m |

2. Mass | kilogram | kg |

3. Time | sec | s |

4. Electric Current | ampere | A |

5. Temperature | kelvin | K |

6. Luminous Intensity | candela | cd |

7. Amount of Substance | mole | mol |