<Table> <Tr> <Th_colspan="2"> Unified atomic mass unit (Dalton) </Th> </Tr> <Tr> <Th> Unit system </Th> <Td> Physical constant (Accepted for use with the SI) </Td> </Tr> <Tr> <Th> Unit of </Th> <Td> mass </Td> </Tr> <Tr> <Th> Symbol </Th> <Td> u or Da </Td> </Tr> <Tr> <Th> Named after </Th> <Td> John Dalton </Td> </Tr> <Tr> <Th_colspan="2"> Unit conversions </Th> </Tr> <Tr> <Td> 1 u or Da in...</Td> <Td>... is equal to...</Td> </Tr> <Tr> <Th_colspan="2"> </Th> </Tr> <Tr> <Th> kg </Th> <Td> 6973166053904000000 ♠ 1.660 539 040 (20) × 10 </Td> </Tr> <Tr> <Th> MeV / c </Th> <Td> 7002931494095400000 ♠ 931.494 0954 (57) </Td> </Tr> <Tr> <Th> m </Th> <Td> 7003182288848619200 ♠ 1822. 888 486 192 (53) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> Unified atomic mass unit (Dalton) </Th> </Tr>

What is an atomic mass unit equal to
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