|physics Also called: Wilson cloud chamber an apparatus for detecting high-energy particles by observing their tracks through a chamber containing a supersaturated vapour. Each particle ionizes molecules along its path and small droplets condense on them to produce a visible track|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
A device used to observe the movements of charged atomic and subatomic particles, such as ions, electrons, or muons. Cloud chambers consist of a closed container filled with a gas that is on the verge of condensing. Charged particles passing through the gas ionize the atoms in their path, forming visible lines of condensation. Compare bubble chamber.