Units Index S.I.Units
Note:
The fundamental units according to BS 5775-0:1993, ISO 31-0:1992 include length, mass, time, electric current, thermodynamic temperature, amount of substance and luminous intensity.
In mechanical engineering the fundamental required units are length, mass and time
| Physical Unit | Name | Symbol | 
| length | metre | m | 
| mass | kilogram | kg | 
| time | second | s | 
| electric current | ampere | A | 
| temperature | kelvin | K | 
| luminous intensity | candela | cd | 
| *plane angle | radian | rad | 
| *solid angle | steradian | sr | 
| Quantity of Matter | mole | mole | 
| 
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* supplementary units
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