Assertion: engine's piston | /r/CapableOf | compress gas
Facets:
value: on the return stroke
type: TEMPORAL
Source sentences:
text: Here the intake valve is closed and the piston travels back up the cylinder, thereby compressing the gasses.
text: When the gas is cooled the pressure drops and this drop means that the piston needs to do less work to compress the gas on the return stroke.
text: Intake valves let fuel and air enter the cylinders, while rising pistons compress these gasses.