The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Uncertainty
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Bohr radius
 $a_{\rm 0}$
 Value  0.529 177 210 67 x 10-10 m
 Standard uncertainty  0.000 000 000 12 x 10-10 m
  Relative standard uncertainty   2.3 x 10-10
 Concise form  0.529 177 210 67(12) x 10-10 m    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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