The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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Correlation coefficient between two constants
Newtonian constant of gravitation
 $ G $
 Numerical value  6.674 30 x 10-11 m3 kg-1 s-2
 Standard uncertainty  0.000 15 x 10-11 m3 kg-1 s-2
  Relative standard uncertainty  2.2 x 10-5
 Concise form  6.674 30(15) x 10-11 m3 kg-1 s-2    
 
alpha particle relative atomic mass
 $A_{\rm r}(\alpha)$
 Numerical value  4.001 506 179 129
 Standard uncertainty  0.000 000 000 062
  Relative standard uncertainty  1.6 x 10-11
 Concise form  4.001 506 179 129(62)    
 
Correlation coefficient r of the above two quantities:
r  =  0.00000
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Source: 2022 CODATA     
recommended values
 
Definition of
uncertainty
 
      Correlation coefficient with
any other constant

 
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