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Click symbol for equation Rydberg constant times hc in J  Numerical value  2.179 872 361 1035 x 10-18 J  Standard uncertainty  0.000 000 000 0042 x 10-18 J   Relative standard uncertainty  1.9 x 10-12  Concise form  2.179 872 361 1035(42) x 10-18 J       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