Fundamental and Derived Units
It is already mentioned that there are two types of physical quantities. The units that are used to measure fundamental physical quantities are fundamental units and are basis and independent in nature.
The derived units are used to measure derived physical quantities and are dependent and are derived from fundamental units.
The seven fundamental physical quantities and their SI units are given in the table:
| Fundamental physical quantities | Fundamental unit |
| Length | Meter (m) |
| Mass | Kilogram (Kg) |
| Time | Second (S) |
| Temperature | Kelvin (K) |
| Current | Ampere (A) |
| Amount of substance | Mole |
| Luminous intensity | Candela (Cd) |
Some derived physical and their SI unit and fundamental unit involved with these units are given in the table:
| Derived physical quantity | SI unit | Dimensional Notation | Fundamental unit involved |
| Area | m2 | L2 | m2 |
| Volume | m3 | L2 | m3 |
| Speed | m/s | L/T | m/s |
| Force | Newton (N) | MLT -2 | kgm/s2 |
| Work | Joule (J) | ML2 T-2 | kgm2/s2 |
| Energy | Joule (J) | ML2T-2 | kgm2/s2 |
| Power | Watt (W) | ML2T-3 | kgm2/s3 |
| Pressure | Pascal (Pa) | ML-1T-2 | kg/ms2 |
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