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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299,792,458 metres per second (approximately 3.00×108 m/s, or 186,282 mi/s); it is exact because the unit of length, the metre, is defined from this constant and the international standard for time.
Foot per second is unit of speed, its symbol is fps. It equals to 0.3048 meter per second or 60 feet per minute. Plural name is feet / second.