SI Base Units
The SI base units are the seven fundamental standard units of measurement defined using a set of seven experimentally measured quantities. All other units in the International System of Units are derived from these seven base units.
Dependency graph of the SI base units and their experimentally measured quantities and other SI base units.
The Base Units
| Base Unit | Symbol | Measure |
|---|---|---|
| second | time | |
| metre | length | |
| kilogram | mass | |
| ampere | electric current | |
| kelvin | thermodynamic temperature | |
| mole | quantity | |
| candela | luminous intensity |
The Base Constants
| Symbol | Measured Constant | Value | Units |
|---|---|---|---|
| Speed of Light | |||
| Boltzmann's Constant | |||
| Planck's Constant | |||
| Elementary Charge | |||
| Avogadro's Number | |||
* sr denotes a steradian which is technically dimensionless |
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