Assertion: lamp's bulb | /r/HasProperty | filled with an inert gas
Facets:
value: as incandescent lamps
type: MANNER
value: to reduce evaporation of the filament
type: PURPOSE
Source sentences:
text: Most modern bulbs are filled with an inert gas to reduce evaporation of the filament and prevent its oxidation.
text: The bulb, made of fused quartz instead of soda lime glass, is filled with the same inert gases as incandescent lamps mixed with small amounts of a halogen gas (usually less than 1% bromine).