The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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electron g factor
 $g_{\rm e^-}$
 Numerical value  -2.002 319 304 362 56
 Standard uncertainty   0.000 000 000 000 35
  Relative standard uncertainty  1.7 x 10-13
 Concise form  -2.002 319 304 362 56(35)    
 
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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