The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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atomic unit of velocity
 $ a_0 E_{\rm h}/\hbar = \alpha c $
 Numerical value  2.187 691 262 16 x 106 m s-1
 Standard uncertainty  0.000 000 000 34 x 106 m s-1
  Relative standard uncertainty  1.6 x 10-10
 Concise form  2.187 691 262 16(34) x 106 m s-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 

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