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abstraction > mathematical concept > number > constant > fundamental physical constant > atomic constant > Thomson cross section
Uparea, atomic constant

Thomson cross section comparison table
Subject has equation is an instance of has uncertainty is a kind of has symbol has value
area   quantity  
atomic constant   fundamental physical constant changes in value are due solely to an increase in measurement accuracy or convention
Thomson cross sectionarea0.000000015 × 10-28 m2 σe0.665245854 × 10-28 m2

Uparea, atomic constant