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Rydberg constant times hc in J  Value  2.179 872 171 x 10-18 J  Standard uncertainty  0.000 000 096 x 10-18 J   Relative standard uncertainty   4.4 x 10-8  Concise form  2.179 872 171(96) x 10-18 J       Click here for correlation coefficient of this constant with other constants Source: 2010 CODATA      recommended values  Definition of uncertainty       Correlation coefficient with any other constant