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spark chamber any of several devices using a great number of parallel, oppositely charged metal plates in an inert gas to detect subatomic particles, rays, or the like, which make trails of sparks between the plates.
spark gap a space between two electrodes in which an electrical discharge, or spark discharge, may occur.
spark plug a device threaded into the cylinder of an internal-combustion engine that produces sparks that ignite fuel. [2 definitions]