SI base quantities
- There is a seemingly endless number of units in physics
- These can all be reduced to seven base units from which every other unit can be derived
- Only five of these are required for this course
- These seven units are referred to as the SI Base Units; this is the only system of measurement that is officially used in almost every country around the world
SI base units
Quantity | SI base unit | Symbol |
Mass | kilogram | kg |
Length | metre | m |
Time | second | s |
Current | ampere | A |
Temperature | kelvin | K |
Examiner Tip
You will only be required to use these five SI base units in this course, so make sure you know them!