The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Bohr magneton in K/T
 $ \mu_{\rm B}/k = e\hbar/2m_{\rm e}k $
 Numerical value  0.671 713 815 63 K T-1
 Standard uncertainty  0.000 000 000 20 K T-1
  Relative standard uncertainty  3.0 x 10-10
 Concise form  0.671 713 815 63(20) K 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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