# Definition:Fundamental Unit (Physics)

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## Definition

A **fundamental unit** a unit of measurement for a measurable physical property from which every other unit for that quantity can be derived.

The **fundamental unit** for a particular measurable quantity is chosen by convention.

They are the **units** of the fundamental dimensions of physics.

## Also known as

**Fundamental units** are also known as **base units**.

## Examples

There are various conventions, as follows:

- SI units (SystÃ¨me International), which evolved from the MKS system
- MKS, that is, Metre-Kilogram-Second
- CGS, that is, Centimetre-Gram-Second
- Imperial or FPS: that is, Foot-Pound-Second.
- Metric System: a more-or-less colloquial name for the system of measurement of values derived from length based on the
**metre**.

There are other more specialized ones.

## Also see

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next):**base units** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next):**base units**