Question

Why do jet planes flying in the sky leave a white trail behind them?

Answer 1

Answer:

hi mate....

Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas.

Answer 2

Answer:

Explanation:

The atmosphere is thin and cold the higher up a plane goes. The exhaust from a plane's engine is much hotter than the atmosphere. The water vapour from the hot plane engine turns to ice mid-air which we see as white lines in the sky caked contrails.