Assertion: central electrode | /r/HasProperty | the hottest part of the plug
Facets:
value: normally
type: DEGREE
Source sentences:
text: The central electrode is usually the one designed to eject the electrons (the cathode, i.e. negative polarity relative to the engine block) because it is normally the hottest part of the plug; it is easier to emit electrons from a hot surface, because of the same physical laws that increase emissions of vapor from hot surfaces (see thermionic emission).