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# Bohr magneton

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

$\mu_B = {{e \hbar} \over {2 m_e}}$
where:
$e$ is the elementary charge,
$\hbar$ is the Dirac's constant,
$m_e$ is the electron rest mass

In the SI system of units it's value is approximately:

$\mu_B$ = 9.274 008 99(37) × 10-24 J·T-1

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