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abstraction > mathematical concept > number > constant > fundamental physical constant > atomic constant > classical electron radius
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classical electron radius comparison table
Subject has equation is an instance of has unit has uncertainty is a kind of has symbol has value
atomic constant    fundamental physical constant changes in value are due solely to an increase in measurement accuracy or convention
radius  length unit length  
classical electron radiusradius 0.00000031 × 10-15 m re2.817940285 × 10-15 m

Next atomic constantFermi coupling constant    Upatomic constant, radius    Previous atomic constantBohr radius