The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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nuclear magneton
 $  \mu_{\rm N} = e\hbar/2m_{\rm p} $
 Numerical value  5.050 783 7461 x 10-27 J T-1
 Standard uncertainty  0.000 000 0015 x 10-27 J T-1
  Relative standard uncertainty  3.1 x 10-10
 Concise form  5.050 783 7461(15) x 10-27 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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