For example , measured with respect to the amount of xenon 132 present , the depletion of xenon 136 ( being four atomicmass units heavier ) would have been twice that of xenon 134 ( two atomic mass units heavier ) if physical sorting had operated 例如,如果物理分离过程确实发生,相对于氙132的含量,氙136的短少量(重量多了四个原子质量单位)会是氙134短少量(重量多两个原子质量单位)的两倍。
英文解释
unit of mass for expressing masses of atoms or molecules