# Unit Vector

A vector has **magnitude** (how long it is) and **direction**:

## Unit Vector

A **Unit Vector** has a magnitude of **1**:

The symbol is usually a lowercase letter with a "hat", such as: |

(Pronounced "a-hat") |

## Scaling

A vector can be "scaled" off the unit vector. Here vector **a** is shown to be 2.5 times a unit vector. Notice they still point in the same direction:

## In 2 Dimensions

You can use unit vectors to help you work with vectors in 2 dimensions:

Here we show that the vector **a** is made up of 2 "x" unit vectors and 1.3 "y" unit vectors.

## In 3 Dimensions

Likewise we can use unit vectors in three (or more!) dimensions: