International System of Units
The International System of Units or SI units defines standard units for measurement of all physical quantities.
In principle, any physical quantity can be expressed in terms of seven base units.
| Property | Unit | Symbol |
| 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 |
Derived Units
Apart from the base units, there are SI units of derived units. These are called as such because their value is determined based on one or more base units. Some examples are given below.
- Frequency – Hertz (Hz); 1 Hz = 1 s-1
- Power – Watt (W); 1 W = 1 kg·m2s−3
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