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Planck constant in eV s  Value  4.135 667 516 x 10-15 eV s  Standard uncertainty  0.000 000 091 x 10-15 eV s   Relative standard uncertainty   2.2 x 10-8  Concise form  4.135 667 516(91) x 10-15 eV s       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