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Bohr magneton

The Bohr magneton (symbol ), sometimes also called Landé factor, is named after the physicist Niels Bohr. It is a physical constant of magnetic moment, defined by:

is the elementary charge,
is the Dirac's constant,
is the electron rest mass

In the SI system of units it's value is approximately:
= 9.274 008 99(37) 10-24 JT-1