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Click symbol for equation Planck length  Value  1.616 252 x 10-35 m  Standard uncertainty  0.000 081 x 10-35 m   Relative standard uncertainty   5.0 x 10-5  Concise form  1.616 252(81) x 10-35 m       Click here for correlation coefficient of this constant with other constants Source: 2006 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant