Details of Unit: Speed Of Light

Unit Name Speed Of Light
Unit Symbolc
Defining Expression 299 792 458 m/s
Simplified Expression 299 792 458 m·s-1
DescriptionSpeed of light in vacuume
Unit CatagoryGeneral
Unit Reference Information

Wikipedia Reference

The speed of light in a vacuum is an important physical constant denoted by the letter c for constant or the Latin word celeritas meaning "swiftness". It is the speed of all electromagnetic radiation in a vacuum, not just visible light.

In metric units, c is exactly 299,792,458 metres per second (1,079,252,848.8 km/h). Note that this speed is a definition, not a measurement. Since the fundamental SI unit of length, the metre, has been defined since October 21, 1983 in terms of the speed of light; one metre is the distance light travels in a vacuum in 1/299,792,458 of a second. Converted to imperial units, the speed of light is approximately 186,282.397 miles per second , or 670,616,629.384 miles per hour, or almost one foot per nanosecond.

Copyright Information on "reference" section of this artical 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Speed of light".

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