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Why do some planes leave contrails and some don t?
Contrails form when jet exhaust emits water vapor that condenses and freezes. Contrails don’t form for every airplane. The atmosphere where the plane is flying needs to have low vapor pressure and low temperature. The short lived ones that only last a couple minutes after a plane passes.
Why do some planes leave a trail of white smoke?
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.
What planes leave contrails?
The primary sources of contrails are consistently jet powered aircraft, particularly those with multiple large high bypass ratio engines like those common on modern airliners and business aircraft.
Why do jet planes leave a trail class 7?
Ans. As a jet plane flies at the extreme heights, it releases hot water vapour and carbon dioxide fumes from its engines. This causes the formation of clouds like white trail behind the flying jet planes.
Do planes dump toilet waste in the air?
It is a mixture of human biowaste and liquid disinfectant that freezes at high altitude. Airlines are not allowed to dump their waste tanks in mid-flight, and pilots have no mechanism by which to do so; however, leaks sometimes do occur from a plane’s septic tank.
Why do airplanes leave a smoke trail when taking off or landing?
Rather, they are simply the result of moisture vapor in an airplane’s exhaust gases. Airplanes typically won’t leave behind a white smoke trail when taking off or landing. For moisture vapor to condense to the point where it creates a white trail, it must be exposed to high altitudes of at least 20,000 feet.
Why do Jets leave a white trail in the sky?
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.
Why do Jets leave a black exhaust trail?
Some earlier generation jets tend to leave black exhaust trails. These are primarily soot from the engine combustion. Also, most jets will leave at least some soot at some power settings. This is due to an incomplete or ineffecient combustion process. More modern engines don’t have this issue except in very rare conditions.
What causes smoke in a jet engine?
Smoke in jet engines is usually from unburnt or partially burnt fuel (or by water injection). Early jet engines used to create a lot of smoke due to these reasons (and due to lack of environmental regulations).