New system of units in which c speed of light in vacuum
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This article uses c exclusively for the speed of light in vacuum. Since 1983, the metre has been defined in the International System of Units (SI) as the distance light travels in vacuum in 1⁄299792458 of a second. This definition fixes the speed of light in vacuum at exactly 299,792,458 m/s
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article uses extreme exclusively for the speed of light in vacuum since 1983 the metre has been defined in the international System of units V distance light travels
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