The quantities which we can measure directly or indirectly are known as physical quantities.These quantities have magnitude, are assigned a unit and sometimes have direction.Base quantities are fundamental physical quantities that are defined independently of other quantities.There are 7 base quantities and units.
| quantity | unit | |
| mass | kg | kilogram |
| length | m | metre |
| time | s | second |
| electric current | A | ampere |
| temperature | K | kelvin |
| amount of substance | mol | mole |
| luminous intensity | cd | candela |