The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Bohr radius
 $ a_0 = \hbar/\alpha m_{\rm e}c = 4{\rm\pi} \epsilon_0 \hbar^2/m_{\rm e} e^2 $
 Numerical value  5.291 772 109 03 x 10-11 m
 Standard uncertainty  0.000 000 000 80 x 10-11 m
  Relative standard uncertainty  1.5 x 10-10
 Concise form  5.291 772 109 03(80) x 10-11 m    
 
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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