The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-hertz relationship
 $(1 \ {\rm kg})c^2/h$
 Value  1.356 392 512 x 1050 Hz
 Standard uncertainty  0.000 000 017 x 1050 Hz
  Relative standard uncertainty   1.2 x 10-8
 Concise form  1.356 392 512(17) x 1050 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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