Physics - Grade XI or Standard XI
Fundamental Quantities and Fundamental Units
Unit:
The reference standard used for the measurement of a physical quantity is called a unit.
Fundamental quantities:
The physical quantities which do not depend on any other physical quantities for their measurements are known as fundamental quantities.
Fundamental units:
The units used to measure fundamental quantities are called fundamental units.
| No. | Fundamental Quantity | S. I. Unit | Symbol |
|---|---|---|---|
| 1 | Length | metre | m |
| 2 | Mass | kilogram | kg |
| 3 | Time | second | s |
| 4 | Temperature | kelvin | K |
| 5 | Electric Current | ampere | A |
| 6 | Luminous intensity | candela | cd |
| 7 | Amount of substance | mole | mol |
| No. | Fundamental Quantity | S. I. Unit | Symbol |
|---|---|---|---|
| 1 | Plane angle | radian | rad |
| 2 | Solid angle | steradian | sr |
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