one of the cooler unit systems and the one everyone needs to use for practical day-to-day usage.
base units
| quantity | unit name | symbol used |
|---|---|---|
| distance | meter | m |
| time | second | s |
| mass | kilogram | kg |
| electrical current | ampere | A |
| temperature | kelvin | K |
| light flux | candela | cd |
| amount | mole | mol |