He could divide all of that by the absolute value of the charge of the positive particle, all over the mass of the positive particle.

他可以把这整个,除以正电粒子的,电荷绝对值除以，正电粒子的质量。

麻省理工公开课 - 化学原理课程节选

And this spin is an intrinsic quality of the electron, it's a property that is intrinsic in all particles, just like we would say mass is intrinsic or charge is intrinsic.

自旋是电子的本征量，它是所有粒子的本征性质，就像我们说质量是本征的或者电荷是本征的。

麻省理工公开课 - 化学原理课程节选

So, how could he know that the charge on the two particles was equal?

就是这两种粒子,电荷量是相等的？

麻省理工公开课 - 化学原理课程节选