The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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kilogram-joule relationship
 $ (1\,{\rm kg})c^2 = ({\rm kg}\,c^2/{\rm J}) \, {\rm J} $
 Numerical value  8.987 551 787...  x 1016 J
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  8.987 551 787... x 1016 J    
 
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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