Question
What are SI units? Name the fundamental SI units.
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Answer
SI Units: In 1960, the general conference of weights and measures proposed revised metric system, called International system of Units i.e. SI system (abbreviated from its French name).
The seven fundamental SI units are as given below:
[Note: Units for other quantities such as speed, volume, density, etc. can be derived from fundamental SI units.]
The seven fundamental SI units are as given below:
| No. | Base physical quantity | SI unit | Symbol |
| i. | Length | Metre | k |
| ii. | Mass | Kilogram | kg |
| iii. | Time | Second | s |
| iv. | Temperature | Kelvin | K |
| v. | Amount of substance | Mole | mol |
| vi. | Electric current | Ampere | A |
| vii. | Luminous intensity | Candela | cd |
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