The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
Sackur-Tetrode constant (1 K, 100 kPa)
 $S_0/R$
 Numerical value  -1.151 707 537 06
 Standard uncertainty   0.000 000 000 45
  Relative standard uncertainty  3.9 x 10-10
 Concise form  -1.151 707 537 06(45)    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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