Subatomic cloud chamber

Video: Eli Sidman; additional Editing: Melanie Gonick

Subatomic particles such as cosmic ray muons, alpha particles, and high energy electrons are striking our bodies all the time. In the cloud chamber, these particles ionize air molecules, creating delicate cloud trails by condensing supersaturated alcohol vapor.

Full version: http://techtv.mit.edu/collections/physicsdemos/videos/3141-cloud-chamber