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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atomic unit of charge density
 $e/a_0^3$
 Numerical value  1.081 202 384 57 x 1012 C m-3
 Standard uncertainty  0.000 000 000 49 x 1012 C m-3
  Relative standard uncertainty  4.5 x 10-10
 Concise form  1.081 202 384 57(49) x 1012 C m-3    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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