User talk:Quondum

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Speed of light[edit]

Hi, Quondum!I have noticed your recent edits to speed of light. I want to ask in this context about the possibility of expressing the speed of an object relatively to speed of light by comparison to the way it is done with the speed of sounds in relative Mach units.--94.53.199.249 (talk) 08:24, 13 January 2015 (UTC)

It is quite normal for physicists to use the speed of light as a unit in many contexts, for example by refering to a particle travelling at 0.999999 c. The further simplification may be made where this unit is omitted, or equivalently treated as equal to 1. You may be interested in reading articles such as Fundamental unit, Natural units and Geometrized units. This would seem to me to be comparable to how the Mach unit is used. —Quondum 15:24, 13 January 2015 (UTC)
Often "β" is used for the ratio of the speed of an object divided by the speed of light,  \beta = \frac{v}{c} \,. JRSpriggs (talk) 06:19, 14 January 2015 (UTC)