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A diffusion cloud chamber continuously supplies vapor from a warmer reservoir toward a colder base. A temperature gradient permits supersaturated vapor in a layer near the base, where new ionization trails can continually form drops. There is no repeated bulk piston expansion cycle. The two instruments share ion-assisted condensation, but their sensitive regions and timing differ.

CERN's modern teaching apparatus uses alcohol-soaked felt, a sealed transparent container, a dark metal base cooled with dry solid carbon dioxide, and a side light. The view is a thin sensitive region near the cold base, rather than a chamber-wide expansion photograph.^[ref][ref]

A physics educator whose work with Paloma Alameda-Meléndez makes particle detection accessible through a homemade diffusion cloud chamber. An alcohol reservoir above a dry-ice-cooled base creates a sensitive vapor layer. Ionization along a passing particle’s path triggers droplets, turning an invisible trajectory into a visible track without a particle accelerator.^[ref]

A physics educator whose joint classroom experiment uses a cloud chamber to connect particle detection with observable condensation. The chamber’s temperature gradient creates vapor that condenses along ionized tracks. Illumination at a low angle reveals those tracks, letting students investigate naturally occurring cosmic rays with simple optical and thermal equipment.^[ref]