Assertion: nitrous oxide | /r/HasProperty | synthesised by english chemist
Facets:
value: in 1722
type: TEMPORAL
Source sentences:
text: Nitrous oxide was synthesised by an English chemist, Joseph Priestly, in 1722 and used as a recreational drug at laughing gas parties.
text: Nitrous oxide is first synthesized by English chemist and natural philosopher Joseph Priestley.