当一个带电粒子快速穿越云室时，水汽会凝结形成一串小液滴，这样便标识出了该粒子的路径；若将容器置于一个磁场中，还能知道粒子所带电荷的性质。
When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge.
一定程度上，在磁场中这些粒子的结构发生改变，有光照射时它们会产生“串扰”颜色。
The structure of these particles changes in a magnetic field in a way that produces “interference” colours when light is shone on them.
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