FINE-STRUCTURE CONSTANT
Definition
A <FINE-STRUCTURE CONSTANT> is a <NUMBER(math)> that has a <Property> characterizing the strength of the electromagnetic interaction between elementary charged particles. It is given by alpha = e^2/(4pi.epsilon_0.h~.c_0) where e is an <ELEMENTARY CHARGE>, epsilon_0 is the electric constant, h~ is the <REDUCED PLANCK CONSTANT>, and c_0 is A <SPEED OF LIGHT> in vacuum