Metric System and SI Units
The metric system preceeded the SI System. The two systems have different basic units.
The metric system has the basic units of
| Measurement | Metric Unit | Abbreviation |
| length | meter | m |
| mass | gram | g |
| time | second | s |
| electric current | ampere | A |
| temperature | Kelvin | K |
| amount of substance | mole | mol |
| luminous intensity | candela | cd |
| Measurement | SI Unit | Abbreviation |
| length | meter | m |
| mass | kilogram | kg |
| time | second | s |
| electric current | ampere | A |
| temperature | Kelvin | K |
| amount of substance | mole | mol |
| luminous intensity | candela | cd |