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Click symbol for equation atomic unit of length  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