EntityQ5997· pop 45· linked from 162 articlesfine-structure constantSign in to savephysical constant quantifying the strength of the electromagnetic interaction between elementary charged particlesConnectionsstrong interactionEntityweak interactionEntityBohr modelEntityNational Institute of Standards and TechnologyEntityelectromagnetismEntityPlanck constantEntityOxford University PressEntityspectral lineEntityFeynman diagramEntityelectroweak interactionEntityperturbation theoryEntityanomalous magnetic dipole momentEntityphysicsEntitynumberEntityenergyEntityStephen HawkingPersonJohannes KeplerEntityquantum mechanicsEntityelectronEntityInternational Standard Book NumberEntityCategoriesArnold SommerfeldDimensionless constantsElectromagnetismFundamental constants