The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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atomic unit of electric dipole moment
 $ea_0$
 Value  8.478 353 552 x 10-30 C m
 Standard uncertainty  0.000 000 052 x 10-30 C m
  Relative standard uncertainty   6.2 x 10-9
 Concise form  8.478 353 552(52) x 10-30 C 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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