Assertion: carbon dioxide | /r/HasProperty | recognized as gas
Facets:
value: by a belgian chemist
type: OTHER
value: in the 17th century
type: TEMPORAL
Source sentences:
text: Carbon dioxide was recognized as a gas different from others early in the 17th century by a Belgian chemist, Jan Baptista van Helmont, who observed it as a product of both fermentation and combustion.