Assertion: sulfur dioxide | /r/CapableOf | form sulfur trioxide
Facets:
value: at moderately high temperatures
type: TEMPORAL
Source sentences:
text: Molten sulfur is burned to form sulfur dioxide, which is cooled, then oxidized, usually in the presence of pellets of porous siliceous material impregnated with vanadium pentoxide and a potassium compound, to form sulfur trioxide at moderately high temperatures.