The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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conductance quantum
 $ G_0 = 2e^2/2\rmpi\hbar$
 Numerical value  7.748 091 729...  x 10-5 S
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  7.748 091 729... x 10-5 S    
 
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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