Let us say that you performed an experiment that would measure the speed of light, and you measured if to be 290, 000, 000 meters per second. From your references, you found out that the standard and exact value for the speed of light is 299, 792, 458 meters per seconds. How far is you result from the correct one?
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The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures 299,792,458 meters per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 199,861,638.67 m/s when passing through the glass of a typical window.
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