The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron gyromagnetic ratio over 2 pi
 $\gamma_{\rm e}/2\pi$
 Value  28 024.952 66 MHz T-1
 Standard uncertainty       0.000 62 MHz T-1
  Relative standard uncertainty   2.2 x 10-8
 Concise form  28 024.952 66(62) MHz T-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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