| Description | Symbol for dimension | Comments | |||
|---|---|---|---|---|---|
| length | l | The one-dimensional extent of an object. | metre (m) | L | |
| Mass | m | The amount of matter in an object. | kilogram (kg) | M | extensive |
| Time | t | The duration of an event. | second (s) | T | |
| Electric current | I | Rate of flow of electrical charge. | ampere (A) | I | |
| Temperature | T | Average energy per degree of freedom of a system. | kelvin (K) | Θ | intensive |
| Amount of substance | n | Number of particles compared to the number of atoms in 0.012 kg of 12C. | mole (mol) | N | extensive |
| Luminous intensity | L | Amount of energy emitted by a light source in a particular direction. | candela (cd) | J |
Base Physical Quantities
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