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en.wikipedia.org/wiki/Speed_of_light

The speed of light in vacuum, commonly denoted c, is a universal physical constant important ... of air for visible light is about 1.0003, so the speed of light in air is about 299,700 km/s (186,200 mi/s) (about 90 km/s (56 mi/s) slower than c).

www.rpi.edu/dept/phys/Dept2/APPhys1/optics/optics/node4.html

"Nothing can travel faster than the speed of light in a vacuum. ... than 5 digits of accuracy, the index of refraction of air is the same as that of vacuum, n= 1.000.

www.quora.com/Is-the-speed-of-light-same-in-air-or-vacuum

In a vacuum, the speed of light remains constant assuming its path does not get interrupted by another medium. This speed, known as C, is equal to - 299792,...

math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_of_light.html

Light is slowed down in transparent media such as air, water and glass. The ratio by ... This defines the speed of light in vacuum to be exactly 299,792,458 m/s.

www.space.com/15830-light-speed.html

May 22, 2012 ... The speed of light in a vacuum is 186282 miles per second (299792 kilometers per second), and in theory nothing can travel faster than light.

van.physics.illinois.edu/qa/listing.php?id=2076

The speed of sound through air is about 340 meters per second. (The speed of sound in water is about 4 times faster than this). The speed of light in air is about  ...