User:Bob K31416/SL

The International System of Units (SI) BIPM 2006

The International System of Units (SI) NIST 2008

Measurement uncertainty

[http://www.measurementuncertainty.org/mu/guide/uncertainty.html 2. uncertainty]

Wavelength of the 3.39‐μm laser‐saturated absorption line of methane Barger1973

Why isn't the speed of light infinite? Scientific American

The International System of Units (SI), NIST, 1991 edition

Frequency standards: basics and applications By Fritz Riehle

Speed of Light From Direct Frequency and Wavelength Measurements

"Speed of Light is a Defined Quantity
 * One fallout of this new definition was that the speed of light was no longer a measured quantity; it became a defined quantity. The reason is that, by definition, a meter is the distance light travels in a designated length of time, so however we label that distance&endashone meter, five meters, whatever&endashthe speed of light is automatically determined. And measuring length in terms of time is a prime example of how defining one unit in terms of another removes a constant of nature by turning c into in [sic] a conversion factor whose value is fixed and arbitrary."

NASA glossary - AU

physical constants

pressure units conversion

Refractive index of gases

http://www.bipm.org/en/CGPM/db/15/2/ c

http://www.bipm.org/en/CGPM/db/17/1/ m

Expanding Confusion: Common Misconceptions of Cosmological Horizons and the Superluminal Expansion of the Universe (2004)