Which below is NOT a way in which a contrail may form?
A) from water vapor in the engine exhaust mixing with air
B) by air cooling as it passes over the aircraft's wings
C) due to heating of the air by the engine exhaust
D) all of the above

Question

Quizplus · Accepted Answer

Contrails form primarily from water vapor in the engine exhaust mixing with cold air (A) or by air cooling as it passes over the aircraft's wings (B). Heating of the air by the engine exhaust (C) does not lead to contrail formation.

Which Below Is NOT a Way in Which a Contrail