The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-electron volt relationship
$(1 \ {\rm u})c^2$
 Value  931.494 028 x 106 eV
 Standard uncertainty    0.000 023 x 106 eV
  Relative standard uncertainty   2.5 x 10-8
 Concise form  931.494 028(23) x 106 eV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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