The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
Units &
Uncertainty
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atomic unit of time
 $\hbar/E_{\rm h}$
 Value  2.418 884 326 509 x 10-17 s
 Standard uncertainty  0.000 000 000 014 x 10-17 s
  Relative standard uncertainty   5.9 x 10-12
 Concise form  2.418 884 326 509(14) x 10-17 s    
 
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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