Physics:Beta (velocity)

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β in special relativity is the velocity, v, of an object relative to the speed of light c:[1] [math]\displaystyle{ \beta = \frac{v}{c} }[/math]

It is less commonly referred to as the Jackson Number.[citation needed]

β is dimensionless and equal to the velocity in natural units. Any expression which involves v, like the Lorentz factor, can be rewritten using β instead. See the Lorentz transformation.


  1. Zangwill, Andrew (2012). Modern Electrodynamics. Cambridge University Press. pp. 828. ISBN 9780521896979.