The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron volt-atomic mass unit relationship
 $ (1\,{\rm eV})/c^2 = [(e/{\rm C})\, {\rm J}/(m_{\rm u} \, c^2)]\, {\rm u} $
 Numerical value  1.073 544 102 33 x 10-9 u
 Standard uncertainty  0.000 000 000 32 x 10-9 u
  Relative standard uncertainty  3.0 x 10-10
 Concise form  1.073 544 102 33(32) x 10-9 u    
 
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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