189 . Why does a plane often have a visible contrail? Why doesn't this always happen? If you look closely at the mark, you will notice that in reality it consists of two or more thin stripes, which then blur and become indistinguishable. Why are several tracks formed at first? How to explain the existence of a gap between the plane and the beginning of the wake? Why does the trail “swell” and “explode” so that it looks like “puffed corn” strung on a string (Fig.)? You may be lucky enough to see not only the trail itself, but also its dark shadow on the clouds. But even more interesting is the dark trail left by a plane flying in a cloud. How is this trace formed?

 Answer:
Each wing leaves behind a vortex flow, which is directed downwards in the center (behind the fuselage), and upwards behind the ends of the wings. Either water vapor contained in the exhaust gases of engines, or atmospheric air cooled during vortex movement, can condense directly. Since most aircraft have two main wings, there will be two tails trailing behind them. The downward central air flow gradually weakens, and the vortices move closer together. Eventually they become indistinguishable. The speed of the central flow increases, as a result of which the inhomogeneities in the contrails intensify: the descending sections of the contrails descend at an even greater speed - it seems as if the contrails are swelling downwards. However, then the vortices converge closely, and the downward movement stops. Then the plane's trail, when viewed from below, becomes like "popcorn", connected by thin sections in which two tracks can be distinguished.

Photo taken from altfast.ru

Why does a plane leave a trail? June 23rd, 2017

Of course, often in the sky you see this trail that is not so “powerful”, but there are some points about it that you might not know.

Check yourself...

Often, raising our heads to the sky, we see a white stripe on it from a flying plane. The trail it leaves behind is called a condensation trail. By the way, we often call it a contrail, but on Wikipedia, opposite “contrail” there is a note “outdated name”. Therefore, we will use the term “condensation”. In addition, this name is “speaking” - this name itself contains the answer to the question of what it is.

As a rule, the direct cause of the wake is exhaust gases from jet engines. They include water vapor, carbon dioxide, nitrogen oxides, hydrocarbons, soot and sulfur compounds. Of these, only water vapor and sulfur are responsible for the creation of contrails. Sulfur serves to form condensation points, while the contrail itself can be formed both from water vapor that is part of the exhaust gases and from steam that is part of the supersaturated atmosphere.

Getting into cold air (and at the altitude at which airplanes usually fly, the temperature is about -40 degrees), the steam condenses around particles of burned fuel and produces tiny droplets, like fog, which form a streak in the sky. We can say that it turns out to be a kind of man-made long cloud. Over time it will dissipate or become part of cirrus clouds.

Why is this trace not always visible?

If for such humidity the ambient temperature is below the dew point, then the moisture forms white condensation trails behind the engines. At low altitudes they consist of water droplets, which usually quickly evaporate and the trail disappears. But when the plane flies at a high altitude, where the air temperature is below -40 ° C, the steam immediately condenses into ice crystals, which evaporate much more slowly.

By the way, aircraft contrails can affect the Earth's climate. If you look at the Earth from a satellite, you can see that in those areas where airplanes often fly, the entire sky is covered with their traces. Some scientists believe that this is good - the tracks increase the reflective properties of the atmosphere, thereby preventing the sun's rays from reaching the Earth's surface. This way you can reduce the temperature of the earth’s atmosphere and prevent global warming. Others believe that it is bad - cirrus clouds arising from the condensation trail prevent the atmosphere from cooling, thereby causing its warming. Time will tell who is right and who is wrong.

Do they want to ban leaving a trace?

Depending on atmospheric conditions and wind speed, a contrail can remain in the sky for up to 24 hours and be up to 150 km long. Scientists from the University of Reading (UK) decided to figure out how to make planes fly without a trace, while maintaining the profitability of transportation.

“It may seem like the plane has to make quite a detour to avoid the contrail. But because of the curvature of the Earth, you only need to increase the distance a little to avoid really long tracks,” says Emma Irwin, author of the study published in the journal Environmental Research Letters.

Their calculations showed that for small short-haul aircraft, deviation from moisture-saturated areas, even 10 times the length of the contrail itself, can reduce the negative impact on the climate.

“For larger aircraft, which emit more carbon dioxide per kilometer, a deviation of three times larger makes sense,” says Irwin. In their study, scientists assessed the climate impact caused by airliners flying at the same altitude.

For example, a plane flying from London to New York, to avoid creating a long wake, only needs to deviate by two degrees, which will add 22 km to its path, or 0.4% of the total distance.

Scientists are currently involved in a project that aims to assess the feasibility of redesigning existing transatlantic routes to take into account the impact of aviation on climate. Implementing the proposals of climate scientists means facing problems in the future in the field of economics and safety of aviation transportation, experts admit. “Air traffic controllers need to assess whether such flight-to-flight reroutings are feasible and safe, and forecasters need to assess whether they can reliably predict where and when contrail clouds may form,” Irwin said.

Contrail (aircraft contrail) is a condensation trail left in the sky by an aircraft flying at high altitude.
Chemtrail is an aerosolized chemical trail produced by chemical and biological weapons sprays by NATO aircraft and US air forces.

The condensation trail from an airplane flying at high altitude disappears literally before our eyes and can be visible for less than one minute. Chemical traces hang in the air for several hours and spread into wide stripes, and then cover the entire sky with a pale, foggy haze.

Contrails (short for "condensation trails") - condensation trails or vapor trails are visible traces of condensed water vapor formed by aircraft engine exhaust. The faster hot exhaust gases cool in the surrounding cold air, the faster a cloud trail of microscopic water droplets and tiny ice crystals forms.

The appearance of visible traces from an aircraft can only occur under certain atmospheric conditions:
flight altitude: above 8 km (in summer - even above 9 km),
Ambient temperature: below -40°C,
Ambient air humidity: 70%.

Description of the condensation process.

The main products of hydrocarbon fuel combustion are carbon dioxide and water vapor. An airplane's condensation trail is a short plume of cloud condensed primarily from atmospheric moisture and, to a lesser extent, from moisture contained in the aircraft's engine exhaust. There are no dust particles in the upper layers of the atmosphere, and even when the temperature reaches below the dew point, atmospheric moisture remains in a gaseous state, that is, transparent and non-scattering light. The flight of an aircraft in the upper layers of the atmosphere causes the appearance of a huge number of condensation centers, which are played by particles ejected from the combustion chambers of engines, on which instantaneous condensation of steam occurs and the deposition of moisture from the surrounding air in the form of drops and ice crystals. These small water droplets and ice crystals form the cloud trail from the plane. Due to this, the aircraft's flight path becomes visible for a very short time and completely disappears in less than a minute.
The high concentration per unit volume of microscopic droplets and ice crystals creates refraction of sunlight and makes the aircraft's condensation trail visible for a short time. Small water droplets very quickly combine into larger ones and then settle into the lower layers of the atmosphere. Therefore, the end of the condensation trail appears translucent, since it contains larger droplets with a smaller amount per unit volume, and almost no longer refracts light.

Chemtrails (short for "chemical trails") are traces of chemical aerosol sprays that began to appear in huge quantities in 1997 over the United States and Great Britain, and then over almost all countries of the world.

Biological and chemical weapons, which have been sprayed from airplanes in “democratic” (slave-owning) countries for many years, lead to the destruction of fertile lands, the poisoning of groundwater, and the death of bees and other insects, as well as birds and animals. The cultivated areas are gradually turning into dead deserts. All this is being done to massively reduce the planet's population.

Oxides of toxic metals such as barium and aluminum form a chemical haze in the form of a pale haze that obscures the sky above the clouds.

This chemical mist is capable of multiplying the effects of electromagnetic energy transmitted from the H.A.A.R.P. system. - a high-frequency transmitter and a powerful beam ionospheric heater, which is a climatic and psychotronic weapon. H.A.A.R.P. built in Norway, Greenland and Alaska and interfaces with space, air and sea-based systems. When this system is used as a climate weapon, the consequences in the affected area will manifest itself in the form of super storms and hurricanes, tornadoes and tornadoes, tsunamis and floods of unprecedented force. When used as a psychotronic weapon, one can control mood (for example, induce fear, horror, aggression or a feeling of hopelessness, apathy, euphoria, etc.) and manipulate people's behavior. But if you use it directly to destroy the population, then, emitting extremely low-frequency radio waves, taking into account the chemical fog layer, which increases the electrical conductivity of the upper layers of the atmosphere, you can destroy all life in the irradiated area.

Viruses made in military laboratories are sprayed over cities and cause flu-like symptoms, severe respiratory complications, outbreaks of unknown diseases, a sharp decrease in immunity and mental abilities... BUT THE AUTHORITIES OF THE USA AND OTHER COUNTRIES ATTRIBUTE THIS EPIDEMIC TO THE NON-EXISTENT "SWINE FLU" VIRUS . Declaring a pandemic to introduce martial law in the United States with subsequent forced vaccination was the purpose of using biological weapons.

The consequences of forced, forceful vaccination will be as follows:
STERELIZATION of the absolute majority of the population (inability to have children),
burning of the immune system and destruction of the brain, destruction of mental abilities in children,
the transformation of people into biorobots, the massive multimillion-dollar death of people.

In the programs of the World Government, one of which is called Agenda 21 (agenda for the beginning of the 21st century), it is planned to destroy more than three billion people by 2011, using such means as ARTIFICIAL HUNGER (the food crisis that will follow the economic crisis at the end of 2009 .); natural disasters caused by the H.A.A.R.P system; and epidemics caused by airplane spraying, followed by mass forceful destructive vaccination.

Additional explanations:
In recent years, propaganda sites have appeared on the Internet that are trying to convince people that the numerous foggy trails in the form of wide stripes left by military aircraft are a normal phenomenon and that it has always been this way, and that there is nothing to worry about at all.
At low altitudes, the visible appearance of condensation trails from an aircraft is generally impossible, since instantaneous condensation and crystallization of moisture requires a very low ambient temperature (less than -40°C).

Methods of disinformation can be the following:
For example, on Wikipedia (an American encyclopedia that often mixes truth with lies), the correct description of contrails is given at the beginning, but the photographs on the side show chemical sprays.
On the official website of NASA, which is a military space organization and an integral part of the structure of the world government, it is said that there are ordinary contrails and there are unusual ones (without much explanation), which supposedly do not disappear for a long time - it’s like turning off the kettle one could observe a highlighted when boiling, steam for several hours, but this is hardly possible.

What are chemtrails? Chemtrails are a new phenomenon that is being observed all over the world. It appears that the government is deliberately using airplanes to spray an aerosol substance that can make people tired and depressed. But why? Conventional exhaust trails left by airplanes dissipate quickly, are not long enough, and are dependent on engine operating conditions. Chemtrails usually expand continuously, gradually turning into stratus clouds consisting of many rings. It should be added that after observing strange traces, chronic diseases worsened in people. Many witnesses noted a cobweb-like substance falling from the sky. Laboratory analysis of the samples that were obtained showed the presence of biological agents such as: Pseudomonas Fluorescens, Streptomyces and a rare enzyme used to create viruses.

A virus specialist with 20 years of research experience has discovered a rare influenza V2 virus that is usually only found in the laboratory. Over the past months, researchers in the United States and Canada have been able to amass an impressive collection of photographs and eyewitness reports describing strange phenomena occurring in the skies above their heads. . We gave independent researchers a close look at various photographs of the phenomenon known as chemtrails. Most people who have seen the photographs and read the reports have had great difficulty relating these phenomena to the normal emissions from airplanes that fly commercially every day. Many of those interviewed described feeling uneasy when they saw these photographs and reports. Those of us who gave in to our sense of natural human curiosity, found the strength to turn off the television, go outside and look at the sky, were rewarded with direct observation of these phenomena. This unique experience of observing the phenomenon allowed many researchers to make the stunning conclusion that some kind of grandiose national project (of the US government) was unfolding above our heads, without clear boundaries.

At present, neither the goals nor the implementers of this project are fully known. Only two facts are crystal clear - this is not an ordinary man-made activity; this phenomenon occurs every day, covering the entire US territory. Airplane Exhausts Are Not Chemtrails Chemtrails are not the normal airplane engine exhausts that we see every day. There are very definite differences in the nature of the formation, development and behavior of these phenomena, which make it possible to draw a clear boundary between them. Normal airplane exhaust consists of tiny ice crystals that form at altitudes above 31,000 feet (10.5 km). At lower altitudes they simply cannot form, regardless of the type and speed of the aircraft. At altitudes above 31,000 feet, the exhaust appears as thin, pointed lines (if the observer is looking vertically upward, perpendicular to the aircraft's attitude). They usually evaporate within a minute and very rarely extend far enough behind the aircraft. In contrast, chemtrails created by aircraft have been observed at altitudes ranging from 8,000 to 33,000 feet. They typically form at altitudes below 30,000 feet. Normal exhaust cannot form at this altitude. Therefore, the observation of exhaust below 30,000 feet is highly likely to be a chemtrail. They usually appear as large smoke trails that tend to become wider and denser over time. They do not evaporate and do not lose density. Parallel chemtrails can merge into large cirrus clouds within a few hours.

Very often, chemtrails resemble the shape of a fish ridge, consisting of many rounded joints. After the appearance of the chemtrail, the blue sky seems to be dotted with a spider's web. Then it may become cloudy and even gray. Chemtrails lead to diseases There have been numerous cases of illness among people in whose area of ​​residence the appearance of chemtrails has been observed. George Filer, editor of a popular weekly online newspaper, provides the following statistics on the increase in cases of a strange disease similar in symptoms to the flu. An outbreak was observed in north Texas during the third and fourth weeks of December 1999. Plano - 98%, Lewisville - 81%, Lakewood - 76%, Dallas - 30%. The Contrail Research and Reporting Center reported that there were unusually high numbers of chemtrail sightings in north Texas during ten days in December 1999. George believes that there is a direct connection between these two events, despite the fact that doctors comment on the outbreak differently (George Filer, Filer’s Files # 1, 2000).

Canadian researcher William Thomas and journalist Erminia Cassini reported that during April 1999, a military transport aircraft dropped chemtrails over Canada and the United States several times. Cassini was able to collect samples of a brown, jelly-like substance that settled on the ground after the plane took off. Following this, a series of strange events occurred. Cassini soon fell ill with the flu. The biologist who analyzed the substance was hospitalized with symptoms of upper respiratory tract damage. The woman whose home was exposed to the jelly-like substance also suffered from the flu, and a month later she had a heart attack. As a result of the analyses, various biological substances that were extremely dangerous to human health were discovered. (William Thomas, Erminia Cassani, Sky Samples Analyzed). Anomalous zones and chemtrails Researcher Tom Dongo from the city of Sedona (Arizona, USA) adheres to an alternative hypothesis for the use of chemtrails. Tom is researching portals and an anomalous zone located 20 miles from Sedona. According to the hypothesis of Tom and other studies of the Sedona anomaly, portals may be passages to other dimensions. Tom’s book “Intersecting Dimensions” is dedicated to this fascinating problem. Dongo believes that the nature of the chemtrails should be sought in a different direction: “...We know very little about this third portal.

We don't know how strong he is or how weak he is. Such anomalies very often disappeared if enough people focused their attention on them. This has happened many times in the past. Sometimes it may seem that someone is deliberately “turning off” such anomalies. We want to gather as much information as possible and explore everything we can while the third portal is still active. I was able to talk to several researchers from other places who told me that the US government knows exactly the locations of all the major portals in our country. The government buys up the land on which the portals are located, isolates these areas, and if this is not possible, simply destroys the portals. There are several compelling arguments to support such claims. Several months before this book was published, on May 22, 1995, the area near the portal we were studying was pollinated with some kind of chemical that gave off a strong odor. This operation was carried out in the dead of night and was carried out from a helicopter or glider. Since 1993, similar “pollinations” have been carried out throughout the country and have not been commented on in any way. According to a private statement from one of the police officials in the state of Montana, similar actions were repeatedly carried out in other US states.

One case, which took place in a western state, was analyzed by a doctor at a heart center in Idaho (Coeur d'Alene, Idaho). The substance was collected from foliage that fell into the pollination zone. When the unusual substance was analyzed in the laboratory, it was found that it contained an unknown biological component (agent). It seemed that the original composition of the substance had been genetically altered. In the case of Sedona, the collected samples have not yet been analyzed. (June 10, 1995: to a doctor in Prescott, Arizona, city , located 30 miles from Sedona), 16 patients came to complain that their homes and ranches had been aerially pollinated by some kind of chemical with a strong, unpleasant odor. The destruction of the portals does not affect the activity of the anomalous zones. It even intensifies...” ( Tom Dongo, Merging Dimensions. The Opening Portals of Sedona. War games in the sky American researcher Mike Blair is more categorical in his conclusions regarding the nature and purpose of chemtrails. In an official report dated June 11, 2001, posted on the Internet, he clearly identifies the main culprits of this phenomenon and the reasons for its occurrence. The basis of chemtrails is barium salts. The spraying of this chemical is part of the military's Advanced Radar MP (RFMP) testing program. Based on the effect of reflection of radio waves, it allows you to observe objects in three dimensions.

To obtain a three-dimensional image, satellites in earth orbit and a network of powerful computers that process and combine incoming signals are also used. For these purposes, a special computer program (VTPRE) was developed. Initially, the 3D radar tracking system could only monitor objects on the water. Experiments with objects on the surface of the earth were not successful, since special atmospheric conditions were required to allow the signal to be conducted in a special way (in military slang - “ducting”). The problem was solved after an aerosol mixture of barium salts began to be sprayed over US territory. Thus, the atmosphere became suitable for carrying high-frequency signals - “pipes”. A physics researcher from Brookhaven explained this effect this way: the chemical and electrical properties of the mixture prevent moisture from dissipating in the atmosphere, concentrating it around an aerosol cloud. This atmospheric condition is favorable for the transmission of military RFMP/VTPRE signals. “By spraying the barium mixture in a linear pattern from point A to point B, this will best maintain communication between strategic points, despite the curvature of the earth.” – he added. “It also provides better control over enemy high-frequency signals.”

However, this is not the only use of chemtrails. Another project is also based on the use of barium salts and is intended to control the weather. This project is supervised by the US Air Force. It is based on patterns first discovered by scientist Nikola Tesla. This project is also known as HAARP, which is based on the manipulation of natural processes. Little is known about this project, despite the fact that work on it began already in the mid-50s. According to some independent researchers, successful tests of climate control units under the HAARP project were carried out in 1998. It is clear that the ability to control the weather - heavy rains, hurricanes, gusty winds, dust storms, droughts - can bring any enemy to their knees without firing a shot. Another project associated with the emergence of chemtrails, funded by the US Defense Advanced Research Projects Agency (DARPA), is aimed at detecting and suppressing a possible enemy biological attack. This program also uses a mixture of barium salts as an aerosol base along with special polymer fibers. This special combination allows the detection of biological agents. In order to test the effectiveness of the program, some biological agents are sprayed into the atmosphere. Researchers believe that a mixture of barium salts, polymer fibers and other chemicals in the atmosphere may be the cause of sudden and unexplained nosebleeds, asthma, various allergies, pneumonia, upper respiratory tract diseases and arthritis. Chemicals sprayed into the atmosphere cause air and soil conditions that can be hazardous to human health, while simultaneously stimulating the growth of disease-causing bacteria.

Barium salts are very well absorbed into the intestinal tract and muscle tissue. However, there are no clinical data that would describe long-term effects on the human body of small doses of barium salts. “The program is kept secret because the Environmental Protection Committee does not need to know about its side effects on the human body. – Said one researcher. “Negative factors are the main reason for secrecy.” For information: BARIUM It is used in vacuum technology, in alloys (printing, bearing). Barium salts - in the production of paints, glasses, enamels, medicine. All soluble barium salts are toxic. Insoluble barium sulfate used in radiology is practically non-toxic. The lethal dose of barium chloride when ingested is 0.8-0.9 g, barium carbonate is 2-4 g. Symptoms: when poisonous barium salts are ingested, a burning sensation in the mouth, pain in the stomach, salivation, nausea, vomiting, loose stools occur. , dizziness. The skin is pale, covered with cold sweat, after 2-3 hours severe muscle weakness occurs (flaccid paralysis of the muscles of the upper limbs and neck). The pulse is slow, weak, there are heart rhythm disturbances, and a drop in blood pressure. Shortness of breath, cyanosis of the mucous membranes. Treatment: gastric lavage, laxatives, siphon enemas. Symptomatic therapy. (Collection-reference book “Home Doctor”, JSC “Paritet”, 1997). Did the aircraft mechanic discover the truth? I searched through many articles, mailing lists, forums and news groups on the Internet in search of answers to questions that I could not get.

In most cases, people simply discussed what chemtrails could be, putting forward well-known hypotheses. I met some researchers who claimed to have comprehensive information. As a result of communicating with them, a copy of a letter was sent to my e-mail, which can answer the question “HOW this is done.” Below I present the full text of the letter, without literary corrections or abbreviations. I tried to make the translation as accurate as possible, although some technical terms confused me: “For reasons that you will understand as you read, I cannot say my name. I work as a civil airline aircraft mechanic at a maintenance station at a large airport. First of all, I want to talk about a certain “hierarchy” among aircraft mechanics. This is very important to my story, and you will soon understand why. Aircraft mechanics work in three main areas. Aviation electronics, engines and flight control systems. Aircraft mechanics working on these systems are at the top of the “hierarchy”. They are followed by mechanics who service air conditioning and hydraulic systems. And finally, the mechanics who service other minor systems. At the very bottom of the hierarchical list are the personnel responsible for the waste disposal system. No one wants to work on the pipes, pumps and tanks of an airliner's lavatory service system. However, at every airport where I have worked, there are 2-3 volunteer mechanics responsible for the toilet and auxiliary machinery system. The rest of the mechanics are happy to let them do it. Usually there are no more than 2 or 3 mechanics willing to do such work. Usually these guys don't get much attention and the rest of the technical staff don't try to establish friendly relations with them. To be honest, I didn’t really think about this problem until last month either. Typically, most airlines have contracts with other airlines visiting the airport. If they have problems with the plane, one of our mechanics will service it. On the other hand, if our aircraft needs assistance at an airport with which we have an agreement, local mechanics will assist us.

Last month, I was unexpectedly called from our technical center to service an aircraft for another airline. The dispatcher who transmitted the request to me did not know what kind of malfunction arose on board the aircraft. When I arrived on site, it turned out that the breakdown had occurred in the waste disposal system. I had no choice but to take on this work. When I entered the technical compartment, I immediately realized that something was wrong here. There were more pumps, tanks and pipes than there should have been. At first I thought the system had been modified. By that time, I had already worked as a mechanic for ten years. While trying to troubleshoot, I quickly discovered additional piping and tanks that were not included in the waste disposal system. At that moment, when I tried to understand their purpose, another mechanic from our center appeared. He was one of those guys who are responsible for such systems. I was relieved to let him deal with the problem. As I was leaving, I asked him about additional equipment. He joked: “Don’t worry about my end of the plane, let it worry about itself!” The next day I had to tinker with the computer in our technical center, looking for the necessary electrical circuit. I tried to find the equipment that I had seen the previous day. To my surprise, the drawings did not indicate the devices that I saw with my own eyes. Having rummaged through the archive files, I also could not find anything. Now I was just curious to find out what this equipment was intended for. The following week, three aircraft were brought into our hangar for a routine check. During the entire inspection, maintenance personnel are present around the aircraft.

After finishing my shift I decided to take a look at the waste disposal system. I was sure that no one would notice that there was an extra mechanic on board. My search was successful - additional equipment was installed on the plane! I began to study the system of pipes, sediments and containers. I found what could be the control unit for this entire system. It was a standard aircraft cabinet, which usually houses instruments and control systems, but there were no markings or inscriptions on it. I was able to easily locate the control wires running from the cabinet to the pumps, but I was unable to locate the control circuits that would go into the mysterious device. The only wires going into the box were the contacts for the aircraft's onboard power system. The entire system consisted of one large and two small tanks. By eye one could determine that their large tank capacity was 50 gallons. The tanks were connected to fill and release valves that went under the fuselage behind the waste disposal system drain valve. During an external inspection, it was not without difficulty that I discovered hidden hatches for access to these valves next to the waste drainage panels. I tried to trace the pipeline leading from the pumps. This hose was connected to a network of smaller tubes ending at the rear surface of the wing and horizontal stabilizers. If you look at the wings of a large airplane up close, you will notice a lot of finger-sized wires. These are static charge drains. They are designed to dissipate static electricity that forms on the surface of the fuselage and wings during flight. Every third wire was a tube of a mysterious system.

The static discharge drains were deliberately removed and strange tubes were installed in their place. At that moment, one of the engineers on the wing noticed me. He ordered me out of the hangar, noting that my shift was over and I was not authorized to work overtime. For the next two days I was too busy to continue my research. A couple of days after my freelance research, I was called to one of the aircraft to replace the temperature sensor. I completed this job in two hours and returned to work with documents. About half an hour later I was called into the office of the head of the technical service. When I showed up at the office, in addition to the boss, two of our employees from the control department and two more people whom I did not know were waiting for me. He told me that serious problems had been discovered. He offered to fill out a fault form for me. He handed me an official form stating that I had installed a defective sensor and asked me to sign it. I tried to object. I explained to them that some mistake had occurred and I had done my job to the fullest. Then two employees from the control department suggested that I go to the plane and together inspect the faulty unit. At this moment I wondered who these two strangers were? The head of the technical service replied that they were representatives of the airline security service, but he did not intend to tell me their names. We approached the plane, which should have already been in the air, but was still parked. Having opened the technical compartment, one of the employees removed the sensor.

He checked the registration number and showed each of us that it was an old sensor. Then we headed to the warehouse. My progress report was checked again. A sealed instrument storage box was removed from the shelf, from which a temperature sensor with a serial number was removed, which I installed. I can't figure out who could have made the change. I was informed that I was fired without any monetary compensation or benefits and had to submit my work within a week. I spent the next day at home wondering what had happened and what hell I had gotten myself into. In the evening the phone rang. An unfamiliar voice said: “Now you know what happens to mechanics who stick their nose into things that aren’t theirs. Next time, if you start working on systems outside of your expertise, you will lose your job. I think this is enough for the first time. I think you’ll be able to get back to work very soon…” BANG! Short beeps were heard on the phone. There was a strange connection between my dismissal and the mysterious pipeline on board the plane. The next morning the director called me. He stated that thanks to my excellent report on the technical condition of the aircraft, it was possible to complete the repairs a day earlier, and that I could begin work immediately. I was completely confused and thought only about one thing, who or what is the director trying to cover up and who are these people? The next day passed as if nothing had happened. No one mentioned the previous incident or the “damaged” sensor. At night I tried to find answers to the questions that were tormenting me on the Internet.

By chance I came across materials about chemtrails. All the ambiguities came together to form a clear picture of reality. The next morning at work, I found a note in my locked closet. It read: “Curiosity killed the cat. You should not visit sites on the Internet that are not within the scope of your professional duties.” THEY are watching me. Now you also know how they work. I don't know what exactly THEY spray, but I can tell you how they do it. I believe THEY use “honey trucks.” This is what we call special tank trucks designed for waste removal. Usually airports enter into contracts with them; no one has the desire to come close to the “honey carriers”. Who wants to stand next to a truck full of crap? While the waste tanks are emptied, they fill the spray system. THEY know the aircraft's routes and apparently can program the sprayer control unit to turn on the system on its own after reaching a certain altitude. The spray tubes in fake static drains are so small that they are simply undetectable. It is not surprising that they have not yet been discovered.” Conclusions 1. Chemtrails exist. They are observed in the USA and Canada. After I showed the draft of the article to my friends, they reported that they had also observed similar phenomena, therefore, chemtrails exist in Russia. 2. Chemical trails are harmful to human health. 3. Research shows that chemtrails contain barium salts and active biological components. 4. Chemtrails can be used by the military to create an advanced 3D radar surveillance system. 5. Chemtrails can be used by the military to control the weather. 6. Chemtrails can be used by the military to prevent the consequences of possible biological warfare. 7. Chemtrails can be used by the military to suppress portals and anomalous zones. 8. The Committee for Environmental Protection is not aware of such tests and does not have the results of analyzes of chemtrails. There is a problem.

Despite numerous opinions from researchers that seem convincing and well-founded, we cannot be completely sure of what chemtrails actually are and why they are needed. One thing is clear, we are again faced with the problem of hiding information. We know from experience that information that “works for war” or poses a “potential danger to human health” is usually hidden. And as long as the military and the government remain silent, as long as planes leave ominous chemtrails behind them, as long as people get sick as a result of “heavenly pollinations,” we should keep a gas mask ready, and when we see a plane in blue sky, run towards the shelter. Who knows what he carries on board?...

 Answer:
The answer is obvious - for the same reason that fog or frost appears when breathing in the cold. Hydrocarbon fuel is burned in aircraft turbines, and one of the combustion products is water, or rather its steam, heated to a high temperature. Hot water vapor, flying out of the turbine nozzle, immediately begins to condense, forming a thread-like cloud consisting of tiny droplets of water or ice crystals, since the temperature at such an altitude is lower −40 °С. Sometimes the air at altitude is oversaturated with moisture, which cannot condense only due to the absence of so-called condensation nuclei - tiny particles, such as dust. In such cases, a flying aircraft, leaving behind soot particles - a product of incomplete combustion of fuel, causes condensation of supersaturated atmospheric vapors. Therefore, by the intensity of the white trail from a flying aircraft, one can judge the air humidity in the upper layers of the troposphere, and therefore the upcoming weather. A quickly disappearing or barely noticeable trace indicates that the air at altitude is dry and the weather will be cloudless. And if the white trail stretches across the entire sky, then you should expect worsening weather.
In photographs taken from satellites, the Earth in many places is covered with a dense white network of traces from flying aircraft (photo from the site fiz.1september.ru).

It has been shown that in some cases the tracks of a flying aircraft turn into clouds with an area of 4000 before 40000 square kilometers, influencing the climate. Therefore, for example, the cessation of flights over the United States for three days after the tragedy of September 11, 2001 sharply increased the transparency of the atmosphere, and as a result, the difference between the average day and night temperatures increased by 1 °C. Thus, white traces from airplanes serve as one of the factors in the global “darkening” of the planet, counteracting its global warming.

Why does a plane leave a trail?

Sometimes long white stripes are visible in the sky, like very narrow clouds. These stripes are woven into bizarre patterns, rush upward, and then suddenly suddenly break off. Each of us knows that this is the trail of a plane soaring high into the sky. Having gone, for example, by taxi to the airport, we can watch how many planes take off and land, but why does a plane flying low leave no trace behind itself, while a plane soaring so high that it is not visible at all begins to leave footprints?

The trail of an aircraft - the so-called contrail - is a visible trail of condensed water vapor that appears in the atmosphere behind moving aircraft under certain atmospheric conditions. The phenomenon is observed most often in the upper layers of the troposphere, much less often in the tropopause and stratosphere. In some cases it can also be observed at low altitudes.

Condensation trails belong to a separate group of clouds - man-made or artificial clouds - Ci trac. (Cirrus tractus, cirrus - feathery, tractus - trail).

The trace gets its name from the condensation process that leads to its appearance. Condensation occurs only under conditions where the amount of water vapor exceeds the amount required for saturation. These conditions are determined by the dew point - the temperature at which the water vapor contained in the air reaches saturation at a given specific humidity and constant pressure. The degree of saturation is characterized by relative humidity - the percentage ratio of the amount of water vapor contained in the air to the amount required for saturation (at the same temperature). In addition to these conditions, the presence of condensation centers is also necessary. At temperatures up to −30... −40 °C, water vapor passes into the liquid phase during condensation; at temperatures below −30... −40 °C, water vapor turns directly into ice crystals, bypassing the liquid phase. The process of evaporation, leading to its disappearance, also plays an important role in the formation of the trace.

There are two main reasons for the conditions for condensation and the appearance of a trace: The first is an increase in air humidity, when water vapor contained in the exhaust gases of an aircraft engine as a result of fuel combustion is added to atmospheric water vapor. This raises the dew point in the limited volume of air (behind the engines). If the dew point becomes higher than the ambient temperature, excess water vapor condenses as the exhaust gases cool. The amount of water vapor emitted by the engine depends on its power and operating mode, that is, on fuel consumption. The second reason is a decrease in air pressure and temperature above the wing and inside the vortices that arise when flowing around various parts of the aircraft. The most intense vortices are formed at the tips of the wing and flaps, as well as at the tips of the propeller blades. If the temperature drops below the dew point, excess atmospheric water vapor condenses in the area above the wing and inside the vortices. The degree of decrease in pressure and temperature depends on parameters such as the mass of the aircraft, the lift coefficient, the magnitude of the inductive drag, etc. Traces formed as a result of a combination of these two reasons are often observed. The formation of a condensation trail is also facilitated by condensation centers in the form of particles of unburned or incompletely burned (soot) fuel. Along with condensation, the reverse process also occurs - evaporation: particles of condensed water vapor evaporate, and the trace disappears over time. The rate of evaporation is affected by the humidity of the air surrounding the trace and the state of aggregation of the trace particles. The drier the air, the faster evaporation occurs. On the contrary, evaporation does not occur when water vapor is in a state of saturation. Condensed water vapor at an air temperature of −30...−40 °C partially, and at temperatures below −40 °C completely transforms into crystals; the evaporation of ice crystals occurs much more slowly than water droplets.

Thus, the possibility of the appearance and duration of existence of a condensation trail, as well as its type, depend on the humidity and temperature of the atmospheric air (all other things being equal). At low humidity and relatively high temperature, there may be no trace at all, since under such conditions the water vapor does not reach a state of supersaturation. The higher the humidity and lower the temperature, the more water vapor condenses, the slower evaporation occurs, and therefore the trail is richer and longer. And at a relative humidity close to 100% and a low temperature, the largest amount of water vapor condenses; high humidity prevents the evaporation of trace particles, which leads to the formation of condensation trails, which can exist for quite a long time, often turning into cirrus or cirrocumulus clouds. Since water vapor in the atmosphere is unevenly distributed, this causes the same “uneven” footprint.

Condensation trails are formed not only at high flight altitudes (hence one of the erroneous names - “high-altitude trail”). At the ice airfield of the Scott Amundsen Polar Station (altitude 2830 m above sea level), under certain conditions (air temperature minus 50 degrees and below), this trail is formed already on takeoff or landing, and behind turboprop aircraft (C-130 " Hercules" from the US Air Force "Snow Wing", which makes unnecessary the discussion about another misnomer - "jet trail".

Condensation trails are still a revealing factor for the activities of military aviation, therefore the probability of their occurrence is calculated by aviation meteorologists using appropriate methods and recommendations are issued to crews. Changing the flight altitude within certain limits allows you to avoid or completely eliminate the undesirable influence of this factor.

There is also an antipode (opposite) to the condensation trail - a “reverse”, “negative” (very rarely encountered names) trail, formed when cloud elements (ice crystals) dissipate within the wake under certain conditions. Reminiscent of “color reversal” in graphic editors of computer programs, when the blue sky is a cloud, and the trace itself is pure blue space. It is clearly observed with stratus or cumulus clouds of insignificant vertical thickness and the absence of other (higher for an Observer from the Earth) cloud layers masking the blue background of the upper layers of the atmosphere. It is observed no less often than condensation trails, but, due to the mentioned specifics, it is less often expected and less illustrated in publications about clouds and materials from those who like to observe these phenomena.

A contrail should not be confused with a wake. A wake is a disturbed region of air that always forms behind a moving aircraft. However, the condensation trail, interacting with the wake, clearly reveals the vortex structure of the disturbed air.

According to climatologists, contrails influence the climate by reducing temperatures by degenerating into cirrus clouds, thereby increasing the Earth's albedo.

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