The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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conductance quantum
 $G_0$
 Value  7.748 091 7346 x 10-5 S
 Standard uncertainty  0.000 000 0025 x 10-5 S
  Relative standard uncertainty   3.2 x 10-10
 Concise form  7.748 091 7346(25) x 10-5 S    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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