Scalar quantities have only magnitude (size).
For example, 11 m and 15 m s-1 are both scalar quantities.
There are many scalar quantities:
Scalar quantities change when their magnitude changes.
Vector quantities have both magnitude (size) and direction.
For example, 11 m east and 15 ms-1 at 30° to the horizontal are both vector quantities.
There are many vector quantities. This guide will use the following six:
Vector quantities change when: