When we use vectors in physics why does the unit vector (for displacement) equals magnitude of 1 or magnitude of 1m?
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"Unit vector" is more of a math concept than a physics concept. Unit vectors are a special case of [basis vectors](https://en.wikipedia.org/wiki/Basis(linear_algebra)), which are part of how we associate a _coordinate system with a vector space. In particular, the basis vectors of a Cartesian coordinate system are unit vectors. – Solomon Slow Nov 02 '18 at 16:45
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Duplicate Is a vector and a unit vector dimensionless? – Farcher Nov 03 '18 at 05:19