单词 | atomic mass unit |
释义 | atomic mass unit [ǝ`täm·ik `mas `yü·nǝt] PHYSICS An arbitrarily defined unit in terms of which the masses of individual atoms are expressed; the standard is the unit of mass equal to one-twelfth the mass of the carbon atom, having as nucleus the isotope with mass number 12. Abbreviated amu. Also known as dalton. |
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