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The dalton or unified atomic mass unit is a non-SI unit of mass defined as 1/12 of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest. The atomic mass constant, denoted m u, is defined identically, giving {{{1}}}. This unit is commonly used in physics and chemistry to express the mass of atomic-scale objects, such as atoms, molecules, and elemen... Wikipedia