❓ why
Why do airplanes leave white trails in the sky?
TechnologyAviation
Quick Answer
They form when hot, moist exhaust cools rapidly at high altitude and water vapor condenses and freezes into tiny ice crystals.
The Full Story
Those white streaks are contrails, short for condensation trails. Jet engines emit water vapor along with tiny soot particles, and at cruising altitudes the air is cold enough that the vapor quickly condenses and freezes. The result is a visible trail of ice crystals. Whether a contrail disappears quickly or lingers depends on humidity: in very dry air it evaporates fast, while in moist upper air it can spread and persist for hours. Contrails are most common around typical jet cruising altitudes near 10 to 12 kilometers.
Key Facts
1.Cruising altitude is often 10–12 km
2.Contrails are made of tiny ice crystals
3.They can persist for hours in moist air
YouTube Angle
Suggested video title for this topic:
"The science behind those white lines in the sky."