Why do planes leave lines in the sky ?

✈️ Ever looked up and wondered: Why do planes leave those white streaks across the sky? Spoiler: it’s not smoke. It’s not pollution. It’s just science. 🌤️ Those lines are called contrails — short for “condensation trails.” When hot jet engine exhaust meets freezing air, the water vapor condenses and forms ice crystals. ❄️ Some flights leave long trails. Others leave none. It all depends on altitude, humidity, and temperature. 🧠 Even scientists study them to better understand our atmosphere. 📌 Now you know: it’s not smoke — it’s physics. Follow @aviationaddict for more fascinating sky secrets! 🌍🛫 #aviationaddict #aviationfacts #avgeek #pilotlife #airplane #contrails #jetengine #skysecrets #aerospace #planephotography #aviationlovers #scienceiscool #stemforkids #aviationdaily #fyp #didyouknow #aviationfun Suscribe to our channel for more aviation videos ! Contact : [email protected]