普朗克常量的平方,乘以π再乘电子的质量。

Square of the Planck constant times pi mass of the electron.

youdao

他大胆地认为空穴的质量就是和电子的质量相同。

He said boldly that the holes had to have the same mass as the electrons.

youdao

它指电子的质量。

It is the mass of the electron.

youdao

If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.

如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。

麻省理工公开课 - 固态化学导论课程节选

And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.

这只是牛顿学上关于动量的表达，用电子质量,乘以瞬时速度。

麻省理工公开课 - 固态化学导论课程节选

I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.

所以我们可以假设电子没有质量,它们占据了，非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。

麻省理工公开课 - 化学原理课程节选