what is meant by this statement that the speed of light in vacuum is unity?

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Solution

This statement means, speed of light in vacuum is one unit.
Where as unit of this speed is given by c = 3*10⁸ m/s

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what is meant by this statement that the speed of light in vacuum is unity?

This statement means, speed of light in vacuum is one unit. Where as unit of this speed is given by c = 3*108 m/s

This statement means, speed of light in vacuum is one unit.
Where as unit of this speed is given by c = 3*10⁸ m/s