-- look up the electrostatic permittivity of free space
-- look up the magnetic permeability of free space
-- multiply them
-- take the square root of the product
-- take the reciprocal of the square root
The number you have is the speed of light in a vacuum.
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The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.
About 2/3 its speed in a vacuum.
The speed of light is 186,000 miles per second in a vacuum.
In a vacuum the speed of red and blue light are the same as all light, 300,000,000m/s. Their frequency and wavelength will be different but the speed remains the same.
The index of refraction.