Discussion
An aircraft's engines produce 120 kilonewtons at sea level. At cruise altitude, with a density ratio near 0.30, the flight manual quotes rather more than 36 kilonewtons available.
Why is the simple density scaling pessimistic?
Answer: B
Thrust follows mass flow and therefore density, but the colder air raises the achievable pressure ratio and cycle efficiency. The two effects act in opposite directions, so the real lapse is gentler than density alone would suggest.
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