The 'c' in that equation stands for the speed of light in a vacuum.
If the equation is being evaluated in metric units, then it's 299,792,458 meters per second.
If in English units, then it's 186,282 miles per second.
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C is the speed of light.
c = the speed of light.
C = speed of light
speed of light
Energy = mass x speed of light(squared)