At what height is an aircraft when it leaves a vapour trail.?
409393
My buudy siitin' with us(watching the Ultimate Fights) is a veteran of the Air Force. His answer was 40,000ft. For sure gonna keep my out for the answers on this question. Good luck!
1103663
To begin with, it's not smoke!\nThe fuel burned in a jet engine is paraffin (kerosene if you are American). Now paraffin is a compound of carbon and hydrogen; the carbon burns to carbon dioxide - which you can't see - and the hydrogen burns to water vapour. At very high altitudes this water vapour condenses and then freezes into ice crystals. This is what you see ... a 'contrail' or a 'condensation trail'.
619362
It is called a contrail,  condensation trail or vapour trail.\n\nCombustion of airplane fuel generates steam in the exhaust. At high altitudes the cold temperature of the atmosphere causes the steam to condense into water droplet or ice crystals (depending on the temperature). \n\nThe condensed water droplets / ice crystals disperse light, making them visible.
258565
The temp drops 5 degrees Fahrenheit for every 1,000 feet-- assuming the air is dry, or 3 degrees F if the air is saturated.  This is called the adiabatic lapse rate--specifically the DRY adiabatic lapse rate, and it (combined with dew point temperatures) determines cloud base heights (ceiling).  This does not take into account extreme convective effects.  This is the "usual" answer.\n\nAn example:  A parcel of air that starts at 70 deg F at ground level will cool to 65 deg F at 1,000 ft. above ground (AGL).  Let's say the dew point (the temperature at which the air is saturated/100% humidity) is 40 degrees, the parcel will rise to 6,000 feet before condensation occurs.  Now the cloud begins to form.  We can say say that this is the height of the cloud base.  At that point, the wet adiabatic rate of 3 degrees per 1,000 ft. takes over.  It's a little more complicated than that in reality, but this is the basic idea.
882711
a)\nRate = Distance/time = (24000 ft)/(20 min) = 1200 ft/min\n\nb)\nTo write A(t), you know that the max. value is 24000 and the plane descends at a constant, linear rate of 1200 ft/min.  Thus, you can write a linear equation of this model:\n\nA(t) = 24000 - 1200t, where t = time (in minutes)\n\nPlugging in 0 (at initial time), the height is 24000 feet, which matches the fact in the problem.\n\nc)\nThough linear functions have infinite ranges and domains, this problem is limited to the realism of the problem.  The range is only limited from the maximium value (24000 ft) to the ground (0 ft).  You can't have a negative value for altitude because that would not make sense in the problem.  The domain is limited to the time in air (20 min).  You can't have a negative time and time after 20 min is irrelevant because the plane has already landed.  Summarizing:\n\nDomain: 0 <= t <= 20\nRange: 0 <= A(t) <= 24000\n\n--------\n\nHope this helps
706293
Hi. Actually hundreds of miles. I saw a jet this evening heading west near sunset and the contrail was tiny, but visible. It was still in the sunlight and about 4 degrees off the horizon.
185946
Oh my God, please don't listen to tex2can about US gov't putting chemicals in the air. Vapour trails, or Contrails, are formed when hot, humid and high pressured AIR (not fuel or chems) from an aircraft engine is mixed with the surrounding air that is at a low temp and pressure. This is true for both the Northern AND southern hemisphere. Where did you hear that it doesn't happen in the Southern hemisphere?\n\nMy only suggestion to as why you don't see them is because there are far less flights in the S.hem than in the north because of geography & more cities/ advanced civilisation in the north.
591626
Like rotary guy noted, when jet fuel (or what’s close to what you and I know as Kerosene) burns, or oxidizes, it creates water, which at higher altitudes freezes and turns to solid water vapor (ice, effectively) making it visible from the ground... a trail of icey "condensation" is left behind each burning engine and that’s where the term con-trail is derived and that’s what those white trails are behind airplanes.  You don’t see them all the time because an important factor in the making of these things is the ambient atmospheric temperature...  Higher temps, no con trails…  incidentally, solid rocket fuel, like on the space shuttle, may look similar to con trails but mostly contains burned sulfites and tiny (totally solid) carbon particles, a little different from the water vapor of the con trail...but it looks the same…too easy!
243394
Vapor trails are a function of flight altitude and weather conditions.  Vapor trails have nothing to do with type of aircraft - does not even have to be a jet. A bit of trivia -during WWII weather forecasters were relied upon to predict altitudes at which vapor trails would occur so our bombers could avoid those altitudes as they approached their targets.  This was essential information since enemy anti aircraft guns could track the flight of high flying aircraft if they flew at vapor trail producing altitudes.
385865
the height at which condensation takes place
908785
very close to 2 meters.
716722
For launch velocity\nv0 = 4.47 m/s,\nlaunch angle\nθ = 66 degrees,\nThe horizontal range is\nR = 1.515173718712374 m.\nThe total time of flight is\nt = 0.83337718278825 s.\nThe peak height is\nh = 0.8507839727702984 m.
912781
Its velocity will be zero when it reaches its maximum altitude.
670367
Unidentified flying object.
1144696
gravity and air resistance.
655529
B. Nitrogen.  It's above 70% in normal air.
358112
about 50 degrees celsius less (about -10 degrees celsius for every kilometer increase in altitude), that is assuming the air parcel is unsaturated.