The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-hartree relationship
 $(1 \ {\rm u})c^2$
 Value  3.423 177 6902 x 107 Eh
 Standard uncertainty  0.000 000 0016 x 107 Eh
  Relative standard uncertainty   4.5 x 10-10
 Concise form  3.423 177 6902(16) x 107 Eh    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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