The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-hertz relationship
 $ (1\,{\rm kg})c^2/h = [{\rm kg}\,c^2/{\rm Hz} \, h)] \, {\rm Hz} $
 Numerical value  1.356 392 489...  x 1050 Hz
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.356 392 489... x 1050 Hz    
 
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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