an exercise in miscellany

Fine-structure constant

In science & nature on June 30, 2013 at 7:14 pm

FineSTructureConstantIn physics, the fine-structure constant (usually denoted α, the Greek letter alpha) is a fundamental physical constant, namely the coupling constant characterizing the strength of the electromagnetic interaction. Being a dimensionless quantity, it has constant numerical value in all systems of units. Arnold Sommerfeld introduced the fine-structure constant in 1916.

The current recommended value of α is 7.2973525698(24)×10−3 = 1/137.035999074(44)

via Fine-structure constant

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