微び細さい構こう造ぞう定てい数すう

noun

fine-structure constant; Sommerfeld constant

A fundamental physical constant, approximately 1/137, characterizing the strength of electromagnetic interaction. Used in quantum electrodynamics.

• 微び細さい構こう造ぞう定てい数すうは約やく137分ぶんの1である。

  The fine-structure constant is approximately 1/137.

• 量りょう子し電でん磁じ力りき学がくでは微び細さい構こう造ぞう定てい数すうが重じゅう要ような役やく割わりを果はたす。

  The fine-structure constant plays an important role in quantum electrodynamics.