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1. Oxford Dictionary

   atomic mass

   • IPA[əˌtɒmɪk ˈmas]

   英式

   • n.
     the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

   • noun: atomic mass, plural noun: atomic masses

2. • 相關詞

   atomic mass unit

   • n.
     a unit of mass used to express atomic and molecular weights, equal to one-twelfth of the mass ...

   Oxford American Dictionary

   relative atomic mass

   • n.
     Another term for atomic mass

   Oxford American Dictionary

   relative atomic mass

   • n.
     the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom ...

   Oxford Dictionary

   atomic mass unit

   • n.
     a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass ...

   Oxford Dictionary

3. • 更多解釋

   atomic mass

   • IPA[əˌtämik ˈmas]

   美式

   • n.
     the mass of an atom of a chemical element expressed in atomic mass units. It is approximately ...

   Oxford American Dictionary