In physics, a scalar is a simple physical quantity that is not changed by coordinate system rotations or translations (in Newtonian mechanics), or by Lorentz transformations or space-time translations (in relativity). This is in contrast to a vector. A related concept is a pseudoscalar, which is invariant under proper rotations but (like a pseudovector) flips sign under improper rotations.

Contents

• 1 Physical quantity
• 2 Examples
• 3 Scalars in relativity theory
• 4 See also
• 5 Notes
• 6 References

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