# Scalar

A scalar is value (such as a measurement) that has only magnitude but not direction. This contrasts with a vector, which has direction as well as magnitude.

Scalar is a high school-level concept that would be first encountered in a pre-calculus course. It is listed in the California State Standards for Linear Algebra.

### Examples

Real Number: | A real number is a number corresponding to a point on the real number line. |

### Prerequisites

Vector: | (1) In vector algebra, a vector mathematical entity that has both magnitude (which can be zero) and direction. (2) In topology, a vector is an element of a vector space. |