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人教版高中《物理》第三册(必修加选修)第72面中关于“质量亏损”的概念是这样定义的:组成原子核的质子与中子的质量之和与原子核质量的差叫做质量亏损.即质量亏损是指原子核的质量亏损而不是原子的质量亏损.而在课后第73面的习题(2)、(3)以及第78面的习题(3)中都是用原子的质量代替原子核的质量来计算质量亏损的,只是在第73面习题(3)中提到计算中可以用原子的质量代替原子核的质量,因为电子的质量可以在相减的过程中消去.而这三个题目中
The concept of “mass loss” in the 72th plane of the PEP High School “Physics” (required for optional addition and correction) is defined as follows: The difference between the mass of protons and neutrons constituting atomic nuclei and the mass of atomic nuclei is called “mass loss”. That is, the mass loss refers to the mass loss of the atomic nucleus instead of the atomic mass loss. However, in exercises (2) and (3) of the 73rd face after class, and in the exercise (3) of the 78th face, they are all replaced by the mass of the atom. The quality of the nucleus to calculate the mass loss is only mentioned in the calculation of the 73rd facet (3). The mass of the atom can be used to replace the mass of the nucleus because the mass of the electron can be eliminated during the subtractive process. Topic