The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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proton g factor
 $ g_{\rm p} = 2\mu_{\rm p}/\mu_{\rm N} $
 Numerical value  5.585 694 6893
 Standard uncertainty  0.000 000 0016
  Relative standard uncertainty  2.9 x 10-10
 Concise form  5.585 694 6893(16)    
 
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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