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Click symbol for equation vacuum magnetic permeability  Numerical value  1.256 637 061 27 x 10-6 N A-2  Standard uncertainty  0.000 000 000 20 x 10-6 N A-2   Relative standard uncertainty  1.6 x 10-10  Concise form  1.256 637 061 27(20) x 10-6 N A-2       Click here for correlation coefficient of this constant with other constants Source: 2022 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant