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 = [m_{\rm u}\,c^2/(2\,hc\, R_\infty)]\, E_{\rm h} $
 Numerical value  3.423 177 6874 x 107 Eh
 Standard uncertainty  0.000 000 0010 x 107 Eh
  Relative standard uncertainty  3.0 x 10-10
 Concise form  3.423 177 6874(10) x 107 Eh    
 
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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