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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fine-structure constant
 $\alpha$
 Value  7.297 352 5698 x 10-3
 Standard uncertainty  0.000 000 0024 x 10-3
  Relative standard uncertainty   3.2 x 10-10
 Concise form  7.297 352 5698(24) x 10-3    
 
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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