Define the atomic mass unit?
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unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.
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The dalton or unified atomic mass unit is a unit of mass widely used in physics and chemistry. It is 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 mᵤ is defined identically, giving mᵤ = m/12 = 1 Da
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