The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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proton magnetic moment to Bohr magneton ratio
 $\mu_{\rm p}/\mu_{\rm B}$
 Numerical value  1.521 032 202 30 x 10-3
 Standard uncertainty  0.000 000 000 46 x 10-3
  Relative standard uncertainty  3.0 x 10-10
 Concise form  1.521 032 202 30(46) x 10-3    
 
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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