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base unit
A unit that is defined arbitrarily rather in terms of combinations of simpler units. There are seven base units in the SI system, as listed in the table below. In addition, the SI system has two dimensionless (or supplementary) units – the radian and the steradian.
| SI base units | ||
|---|---|---|
| mass | kilogram | kg |
| length | meter | m |
| time | second | s |
| current | ampere | A |
| amount of substance | mole | mol |
| temperature | kelvin | K |
| luminous intensity | candela | cd |
Compare with derived unit.
Related category
• UNITS
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