Why Planes Leave White Trails in the Sky

Date: 2020-01-01 17:00:04


Even though traveling by plane is common nowadays, these huge steel birds are still surrounded by secrets and myths that give birth to a lot of questions. Pardon the pun, but it’s high time to get more answers!

Ever noticed, for example, how on a cold day, you see your own puff of breath when you exhale? The exact same thing happens to a plane. The temperature at 25,000 feet or higher, which is cruising altitude, is really low, around -30 degrees Fahrenheit. Ok, but why are these contrails sometimes long and sometimes short?

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Why do planes leave white trails in the sky? 0:20
Why can’t planes fly when it’s extremely hot? 1:46
Can a plane fly on one engine? 2:26
Do planes’ oxygen masks have only 15 minutes of air? 3:05
What are those white spiral marks on airplane engines? 3:35
Is there the “safest” seat on an airplane? 4:03
Why are there black triangles inside a plane’s cabin? 4:30
Why are airplane windows round? 5:05
Why does the plane’s food taste bad? 5:36
Is it possible to avoid turbulence? 6:04
Why do your ears pop during flying? 6:41
Are a plane’s tray tables the dirtiest things on board? 7:17
What citizenship does a baby born on board get? 7:47
Why are most planes white? 8:20
Why are there no parachutes on board? 8:53

#planes #aviation #brightside

– The cold air condenses, and sometimes even freezes the hot exhaust fumes, creating those white “tails” which look a lot like smoke. That’s why they’re often called “condensation trails”, or contrails.
– Long contrails form in humid conditions, while low humidity makes them much shorter.
– Hot air is less dense than cool air. This means the air molecules are spread further apart from each other, so they come into contact with the plane’s wings less. As a result, it’s harder for a plane to take off.
– Losing an engine in-flight isn’t even considered a serious problem by pilots. This is mainly because planes that fly over oceans, or for long-distance routes, have special certificates that indicate the exact time they can operate safely with one engine.
– If the cabin is depressurized at a high altitude, the passengers won’t be able to breathe, so they use oxygen masks. At the same time, the pilot will start descending right away to get lower than 10,000 feet, where it’s possible to breathe normally again.
– Most airlines claim that the safest seat is just a myth. But statistics of airplane crashes beg to differ. They say that this seat is at the back.
– The black stickers are located on about four windows in a cabin. Each of them is aligned with the edge of the wings.
– The frequent pressurization and depressurization caused the window corners to deform and even break. Turned out, round windows can withstand the pressure of cruising altitude much better.
– Apart from the fact that, on board, you’ll get only defrosted dishes which’ve lost a big part of their flavor, the pressurization of the cabin is to blame.
– If you’re a nervous flyer, here’s a tip for you – choose morning flights, because the air is less bumpy at this time.
– Ears pop because there’s a rapid change in pressure when a plane reaches a cruising altitude or lands. There’s not enough time for the pressure inside the inner ear and the air pressure outside to equalize.
– Sadly, tray table surfaces have eight times more bacteria than the lavatory flush buttons. Unfortunately, quite often, cleaning crews don’t have enough time between flights to take care of everything properly.
– A newborn can become the citizen of the country where the airline is registered; the country over which they were born; or the country where the plane landed.
– Training for skydivers requires many hours, in which they learn all the details about handling a parachute and how to land safely. What’s more, even the most experienced skydivers don’t jump from an altitude higher than 15,000 feet.

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