Why do planes leave white lines in the sky?
Jet planes leave white trails in the sky for the same reason you can sometimes see your breath on cold days. The hot, humid vapor coming out of jet engines mixes with the Earth's atmosphere.
The air in these layers has a lower pressure and temperature than jet engine steam, where it condenses. The water vapor in the jet exhaust may sometimes freeze, forming a cloud very similar to the one your hot breath creates on a cold day.
Jet engine steam contains carbon dioxide, sulfur oxides, nitrogen, unburned fuel, some metal particles, as well as water vapor. This mixture helps condense water vapor in the high layers of the atmosphere.
Therefore, depending on the altitude of the aircraft and the temperature and humidity of the atmosphere, these effects may vary in thickness, extent, and duration. The nature and continuity of the effects of jet engines can be used to predict the weather.
A thin, short-lived line indicates low-humidity air at high altitudes and is a sign of moderate weather, while a long-lived thick line reflects the presence of humid air at high altitudes and can be an early indicator of a storm. .
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