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Click symbol for equation characteristic impedance of vacuum  Numerical value  376.730 313 668  Standard uncertainty    0.000 000 057   Relative standard uncertainty  1.5 x 10-10  Concise form  376.730 313 668(57)       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