This demonstration shows that ions can act as condensation nuclei in a supersaturated vapour. This idea is used to reveal the tracks of alpha particles in both the expansion-type cloud chamber and the diffusion cloud chamber. This is useful preparation for both of these experiments.
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Might be useful if you want to show how a cloud chamber works but don't have one. I am still not sure that I would do this though, I will probably just use a youtube video.
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