The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton gyromagnetic ratio
 $  \gamma_{\rm p} = 2\mu_{\rm p}/\hbar $
 Numerical value  2.675 221 8744 x 108 s-1 T-1
 Standard uncertainty  0.000 000 0011 x 108 s-1 T-1
  Relative standard uncertainty  4.2 x 10-10
 Concise form  2.675 221 8744(11) x 108 s-1 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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