Wilson cloud chamber

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Wilson cloud chamber

(Or, simply, cloud chamber.) A device that renders visible the paths of high energy subatomic particles.

A supersaturated vapor condition is created in a chamber filled with dust-free air by a sudden adiabatic expansion and cooling. In this environment, the small ions formed along the path of a high energy particle act as effective condensation nuclei. The line of droplets so formed can be used to mark the path.
See meteorological cloud chamber.

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