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What is refrective index what is the speed of light in vaccume air and liquid state

how it can be possible that there is VACUUM AIR and ITS LIQUID STATE


Refractive index is the ratio of velocity of light in vacuum to velocity of light in any another medium.
the speed of light in air is 186000 miles/second
the speed pf light in water is 225563010 meter/second
1 5 1
The refractive index (symbol n) of a material is the ratio of the speed of light in a vacuum to its speed in the material .
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speed of light in water = 225,563,010 m/s
Speed of light in a vacuum is = 2.99 x 10^8 m/s
Speed of light in air = 2.99 x 10^8 / 1.003 = 2.981 x 10^8 m/s
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