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A unit vector is defined as a vector that has a magnitude of 1 and retains the direction of the original vector. This means that a unit vector provides a way to express the direction of a vector without scaling it by its magnitude. Unit vectors are commonly used in physics and engineering to simplify the analysis of vector quantities, making it easier to work with direction alone.

Transforming any vector into a unit vector involves dividing the original vector by its magnitude. This process ensures that while the direction of the vector remains unchanged, its magnitude is normalized to one. For instance, if you have a vector \( \vec{v} \) with a magnitude \( | \vec{v} | \), the corresponding unit vector \( \hat{v} \) can be expressed as:

\[

\hat{v} = \frac{\vec{v}}{| \vec{v} |}

\]

This normalization is particularly important in vector analysis because it allows for the combination of vectors purely on the basis of direction, facilitating calculations in fields such as mechanics and electromagnetism.