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单词 mass defect
释义 mass defect
noun
: the difference between the mass of an isotope and its mass number expressed in atomic mass units and being either positive or negative
 < the mass defect of the carbon isotope 6C12, mass 12.00388, is +0.00388, while that of phosphorus 15P31, isotopic mass 30.984, is -0.016 >
— compare binding energy, packing fraction
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