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Correlation coefficient between two constants fine-structure constant  Numerical value  7.297 352 5693 x 10-3  Standard uncertainty  0.000 000 0011 x 10-3   Relative standard uncertainty  1.5 x 10-10  Concise form  7.297 352 5693(11) x 10-3       Bohr radius  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       Correlation coefficient r of the above two quantities: r  =  0.99992 Click here to select a new correlation pair Source: 2018 CODATA      recommended values  Definition of uncertainty        Correlation coefficient with any other constant