cloud-chamber

cloud chamber

noun Physics.
an apparatus for determining the movements of charged particles, consisting of a chamber containing a supersaturated mixture of gas and vapor, the vapor condensing around ions created by the particle in its passing, thereby revealing the path of the particle.
Compare bubble chamber.


Origin:
1895–1900

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Collins
World English Dictionary
cloud chamber
 
n
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

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American Heritage
Science Dictionary
cloud chamber  
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.
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