Assertion: spark plug's electrode | /r/CapableOf | form one or more spark gaps
Facets:
value: between one or more protuberances
type: LOCATION
value: between structures
type: LOCATION
Source sentences:
text: The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode and usually one or more protuberances or structures attached to the inner end of the threaded shell and designated the side, earth, or ground electrode(s).