Scalar
A scalar is a physical quantity that is completely described by its magnitude (size) alone, without any specific direction. Common examples include mass, temperature, distance, and time.
Example
A speed of $50 \text{ km/h}$ is a scalar quantity. If we multiply a vector by a scalar, such as $2 \times \begin{pmatrix} 1 \\ 3 \end{pmatrix}$, we get a new vector $\begin{pmatrix} 2 \\ 6 \end{pmatrix}$, which changes its length but keeps its parallel direction.
See Also
- Vector
- Scalar Multiplication