spark gap
火花隙
Spark gap. Elec. The space filled with air or other dielectric between high potential terminals (as of an electrostatic machine, induction coil, or condenser), through which the discharge passes; the air gap of a jump spark.
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spark gap
n 1: a component of an ignition system; consists of two shaped
electrodes and the space between them
2: the gap between two high-potential terminals