The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
Units &
Uncertainty
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Click symbol for equation
atomic unit of velocity
 $a_0E_{\rm h}/\hbar$
 Numerical value  2.187 691 263 64 x 106 m s-1
 Standard uncertainty  0.000 000 000 33 x 106 m s-1
  Relative standard uncertainty  1.5 x 10-10
 Concise form  2.187 691 263 64(33) x 106 m s-1    
 
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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