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Fine-Structure Constant

The "Fine-structure Constant" is a fundamental physical constant, namely the coupling constant characterizing the strength of the electromagnetic interaction.

http://dbpedia.org/resource/Fine-structure_constant

http://physics.nist.gov/cuu/Constants/bibliography.html

http://en.wikipedia.org/wiki/Fine-structure_constant

http://www.iso.org/iso/catalogue_detail?csnumber=31895

\(a = \frac{e^2}{4\pi\varepsilon_0\hbar c_0}\), where \(e\) is the elementary charge, \(\varepsilon_0\) is the electric constant, item \(\hbar\) is the reduced Planck constant, and \(c_0\) is the speed of light in vacuum.

\(a\)

http://www.iso.org/iso/catalogue_detail?csnumber=31895