● UNITS & QUANTITIES
Physics describes the laws of nature. This description is quantitative and involves measurement and comparison of physical quantities. To measure a physical quantity we need some standard unit of that quantity.
We can define a set of fundamental
quantities as follows :
(a) The fundamental quantities should be independent of each other, and
(b) All other quantities may be expressed in terms
of the fundamental quantities.
Physics describes the laws of nature. This description is quantitative and involves measurement and comparison of physical quantities. To measure a physical quantity we need some standard unit of that quantity.
We can define a set of fundamental
quantities as follows :
(a) The fundamental quantities should be independent of each other, and
(b) All other quantities may be expressed in terms
of the fundamental quantities.
| Quantity | Name of unit | symbol |
| Mass | kilogram | k |
| Length | metre | m |
| Time | second | s |
| Current | ampere | A |
| Amount of substance | mole | mol |
| Temperature | Kelvin | K |
| Intensity | candela | cd |