The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron magnetic moment to Bohr magneton ratio
 $\mu_{\rm e}/\mu_{\rm B}$
 Value  -1.001 159 652 180 91
 Standard uncertainty   0.000 000 000 000 26
  Relative standard uncertainty   2.6 x 10-13
 Concise form  -1.001 159 652 180 91(26)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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