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Inch per second is unit of speed, its symbol is ips or in/s. It equals to 0.0254 meter per second or 60 inches per minute. Plural name is inches per second.
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.