The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Avogadro constant
 $N_{\rm A},L$
 Value  6.022 141 29 x 1023 mol-1
 Standard uncertainty  0.000 000 27 x 1023 mol-1
  Relative standard uncertainty   4.4 x 10-8
 Concise form  6.022 141 29(27) x 1023 mol-1    
 
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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