spark-chamber

spark chamber

noun Physics.
a device for detecting elementary particles, consisting of a series of charged plates separated by a gas so that the passage of a charged particle causes sparking between adjacent plates.

Origin:
1960–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spark chamber
 
n
physics a device for detecting ionizing radiation, consisting of two oppositely charged metal plates in a chamber containing inert gas, so that a particle passing through the chamber ionizes the gas and causes a spark to jump between the electrodes

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