单词	atomic mass unit
释义	atomic mass unit noun : a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to ¹/₁₂ the mass of a single atom of the most abundant carbon isotope 12C called also dalton Example Sentences Recent Examples on the Web What’s more, the large compounds are likely fragments of even larger parent molecules that could weigh thousands of atomic mass units, Postberg says. National Geographic, 27 June 2018 Previously, Cassini detected lighter, gassy molecules such as methane and ethane, which contain one or two carbon atoms and a smattering of hydrogens; these molecules weigh in at around 15 atomic mass units. National Geographic, 27 June 2018 Word History First Known Use circa 1942, in the meaning defined above Medical Definition atomic mass unit noun : a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to ¹/₁₂ the mass of a single atom of the most abundant carbon isotope 12C called also dalton
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