Assertion: engine's efficiency | /r/CapableOf | improve with increasing altitude
Facets:
value: slightly
type: MANNER
value: at any given throttle
type: TEMPORAL
Source sentences:
text: At any given throttle, the thrust and efficiency of a rocket motor improves slightly with increasing altitude (because the back-pressure falls thus increasing net thrust at the nozzle exit plane), whereas with a turbojet (or turbofan) the falling density of the air entering the intake (and the hot gases leaving the nozzle) causes the net thrust to decrease with increasing altitude.