The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of magnetic dipole moment
 $  \hbar e/m_{\rm e} = 2\mu_{\rm B} $
 Numerical value  1.854 802 015 66 x 10-23 J T-1
 Standard uncertainty  0.000 000 000 56 x 10-23 J T-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  1.854 802 015 66(56) x 10-23 J T-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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