why do they leave marks in the sky?? -===>
2006-11-20 10:42:31 · 3 answers · asked by F23 1 in Cars & Transportation ➔ Aircraft
I think its called a contrail. check it out on wikipedia- http://en.wikipedia.org/wiki/Contrails
2006-11-20 11:02:54 · answer #1 · answered by Dan 5 · 0⤊ 0⤋
A jet engine, like a rocket engine, is a reaction engine. It works by throwing mass in one direction and taking advantage of the reaction in the opposite direction. In the case of a jet engine, the engine burns fuel (like kerosene) with air from the atmosphere. The burning fuel heats and expands the air, and this hot air shoots out of the exhaust-end of the engine to create thrust.
2006-11-20 18:55:22 · answer #2 · answered by jmusician 1 · 0⤊ 1⤋
Because the air is laden with moisture from the combustion process and rapidly cooled to saturation after it exits the engine.
2006-11-20 23:44:54 · answer #3 · answered by Anonymous · 0⤊ 0⤋