The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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joule-kilogram relationship
 $ (1\,{\rm J})/c^2 = [{\rm J}/({\rm kg} \, c^2)] \, {\rm kg} $
 Numerical value  1.112 650 056...  x 10-17 kg
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.112 650 056... x 10-17 kg    
 
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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