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Hi, lilian3fena!

Please click on the following link.

LINK (http://lmgtfy.com/?q=Speed+of+Light)

Thanks!

186,000 mps

Now, see? That's what we get for posting within the same minute, martinizing2! LOL! :)

The speed of light is 300000km/s in vacuum or air. But in different medium it is reduced .the amount of reduction is calculated by dividing the speed of light by refractive index of the material.so, speed of light is maximum in vacuum because it has refractive index of "one"