<Table> <Tr> <Th> Constant </Th> <Th> Symbol </Th> <Th> 2014 CODATA value </Th> <Th> Relative standard uncertainty </Th> <Th> Correlation coefficient with N </Th> </Tr> <Tr> <Td> Proton - electron mass ratio </Td> <Td> m / m </Td> <Td> 1836.152 673 89 (17) </Td> <Td> 9.5 × 10 </Td> <Td> − 0.0003 </Td> </Tr> <Tr> <Td> Molar mass constant </Td> <Td> </Td> <Td> 0.001 kg / mol = 1 g / mol </Td> <Td> 0 (defined) </Td> <Td>--</Td> </Tr> <Tr> <Td> Rydberg constant </Td> <Td> </Td> <Td> 10 973 731.568 508 (65) m </Td> <Td> 5.9 × 10 </Td> <Td> − 0.0002 </Td> </Tr> <Tr> <Td> Planck constant </Td> <Td> h </Td> <Td> 6.626 070 040 (81) × 10 J s </Td> <Td> 1.2 × 10 </Td> <Td> − 0.9993 </Td> </Tr> <Tr> <Td> Speed of light </Td> <Td> </Td> <Td> 299 792 458 m / s </Td> <Td> 0 (defined) </Td> <Td>--</Td> </Tr> <Tr> <Td> Fine structure constant </Td> <Td> α </Td> <Td> 7.297 352 5664 (17) × 10 </Td> <Td> 2.3 × 10 </Td> <Td> 0.0193 </Td> </Tr> <Tr> <Td> Avogadro constant </Td> <Td> </Td> <Td> 6.022 140 857 (74) × 10 mol </Td> <Td> 1.2 × 10 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Constant </Th> <Th> Symbol </Th> <Th> 2014 CODATA value </Th> <Th> Relative standard uncertainty </Th> <Th> Correlation coefficient with N </Th> </Tr> <Tr> <Td> Proton - electron mass ratio </Td> <Td> m / m </Td> <Td> 1836.152 673 89 (17) </Td> <Td> 9.5 × 10 </Td> <Td> − 0.0003 </Td> </Tr> <Tr> <Td> Molar mass constant </Td> <Td> </Td> <Td> 0.001 kg / mol = 1 g / mol </Td> <Td> 0 (defined) </Td> <Td>--</Td> </Tr>

All valid methods for calculating avogadro’s number would indicate a constant value