Assertion: hydrogen's energy | /r/CapableOf | exceed the energy
Facets:
value: always
type: TEMPORAL
value: at maximum practical efficiency
type: MANNER
Source sentences:
text: However, in practice no systems are perfectly closed, and the energy required to generate the oxyhydrogen will always exceed the energy released by combusting it, even at maximum practical efficiency, as the second law of thermodynamics implies (see Electrolysis of water#Efficiency).