Assertion: fuel cell's fuel | /r/HasProperty | hydrogen gas
Facets:
value: almost always
type: TEMPORAL
value: with oxygen in air
type: OTHER
Source sentences:
text: The fuel is almost always hydrogen gas, with oxygen (or oxygen in air) as the oxidizer.
text: Fuel cells work by converting the chemical energy found in the fuel, e.g. hydrogen gas, into electrical energy (electricity).