Why pumped tires with nitrogen and what it gives. Pumping car tires nitrogen: pros and cons of nitrogen in wheels good or bad

In recent years, tire workshops are trying to popularize a new service - filling the automotive tires with nitrogen instead of ordinary air. This topic overturned by many non-bullies and myths, since the sellers endow "nitrogen" rods with fictional advantages, and opponents put forward theories not proven by practice. Why pump the wheels with pure nitrogen and what real advantages receives a driver, read in this publication.

Gas pumping technology

From the school year of physics, it is known that 78% of nitrogen is already contained in the surrounding air (there are in mind volumetric stakes). The remaining 22% are distributed between oxygen (almost 21%) and a good tenth of various gases whose share is about 1%. Also in the air medium dissolved water vapor, constituting from 0.2 to 2.5% of the volume of gases. This value varies depending on the weather, the period of the year and the latitude of the terrain.

The essence of the technology is simple: to highlight 78% of the gas and fill the car cylinders. In practice, the download of nitrogen into the tires is made as follows:

1. The wheel valve is connected to the hose to the automatic vacuum-nitrogen setup.
2. After turning on the unit completely sucks the air mixture from the tire.
3. By skipping it through the system of special filters and a dryer, the installation issues a nitrogen with a purity of at least 95%.
4. Purified gas is pumped into the wheel in compliance with the pressure required by the manufacturer.

Processing ordinary air, the nitrogen generator not only removes oxygen and other impurities, but also catches water vapor. This fact should be taken into account in the further consideration of the issue to separate the real advantages and cons of the procedure from the myths.

Reference. Before technical experts serving the Formula 1 race and a variety of rally, such a question is not worth it. The skates of all damage are filled with nitrogen by default.

Real and fictional advantages

To begin with, it is worth lifying all the advantages specified on billboards near tire workshops. What gives the use of nitrogen in car cylinders according to sellers of service:

• constant tire pressure regardless of ambient temperature and road surface;
• improving the clutch with the road and slowing the wear of the tread;
• the course of the car becomes softer;
• tires are not descended over time;
• reducing the brake path and improving overclocking dynamics;
• the probability of the explosion of the tires during loads is noticeably reduced.

When heated rubber pressure does not increase

On the effect of thermal air expansion in the tires, all drivers, shaking skates, know on their own. The essence is as follows: when warming comes on the street, gas in the cylinders expands and the pressure in the wheels increases by 0.2-0.5 bar. Conversely, after the onset of cold weather, the skates "sank." Advertising claims: The coefficient of thermal expansion of nitrogen is 7 times less, so tire pressure is practically not changed.

The opponents of this theory are based on the laws of physics, according to which all gases are expanding the same. That is, the difference in pressures in wheels pumped by nitrogen and air mixture, meager.

In practice, the situation is different: tire pumping with nitrogen really allows you to keep pressure on the same level regardless of the temperature on the street. Probably, there is a role in the air of water vapors that are missing in the nitrogen in the air (remember - gas is dried before downloading).

Improving the operational properties of rubber

The clutch of the working surface of the road coating wheels depends on many factors, including:

• rubber properties, product quality;
• shape, drawing and tread design;
• the magnitude of the spots of the contact and the distribution of efforts in it;
• type and condition of the road surface.

The type of gas, uploaded to the bus, does not affect the adhesion and wear of the tread. You can artificially change the pressure in the rods and in such a way to increase or decrease the contact stain, but the contents of the cylinder does not have. The statement does not correspond to reality.

Soft car running

Another answer to the question is for what to fill the tires with nitrogen, it sounds like this: pumped by this gas is not so elastic as an air. As a result, the wheel bounces less from the irregularities of the road, riding becomes more comfortable, and the suspension serves longer.

The argument is illustrated by a smaller weight of nitrogen compared to air, although in reality the difference is small. There is an interesting point: the proportion of the air mixture is a variable value depending on the temperature and content of moisture. If you pump the cold air for minus 20 ° C, then the weight of 1 m 3 is 1,396 kg, warm (+10 ° C) - 1.248 kg.

Practical observations have shown that the softening of the course is felt when driving on small irregularities on the vehicles of the budget price category with a classic suspension. In business and premium machines, the comfort improvement is not felt, because an effective multi-dimensional suspension is used there.

Skates do not descend

Advertising reads: nitrogen molecule larger air particles, so it does not "break" in microcracks of rubber, inevitably resulting as a result of operation in uneven roads. Therefore, the tires do not descend for a long time and do not require swaps.

The approval refers to the discharge of absurd. The difference between air and nitrogen particles is so scant (0.02 nanometer), that in the event of a crack of the molecule of both gases, it is free to penetrate into it. What happens in practice: for the same time, the "air" wheel loses 0.5 bar, filled with nitrogen - 0.47 bar.

Raising riding quality and safety

When the tires are pumped up with nitrogen, the acceleration speaker improves and the brake path of the car is shocked. This argument is a logical consequence of the wrong statement on improving the clutch with the road surface. So, in reality, overclocking and braking the machine remains unchanged, and the advantage is fictional.

Safety ride rises on the ground that "nitrogen" skates are less exploded. The share of truth in such conclusions is: Tires are bursting from a large load and heating, which is why the air pressure in the cylinder increases to critical. Nitrogen more to increase the temperature and does not give pressure growth, so rubber explodes less frequently.

Obvious shortcomings

In general, pumping tires with nitrogen is useful. No wonder this gas is widely used in the sphere of ring races and rally. There are only two minuses:

• decent price of the service;
• the impossibility of paging and loss of nitric mixture in case of puncture of the wheels on the way.

Compared to ordinary air, the price of filling with nitrogen is 5-10 times depending on the region. Knowing what real minuses and pros gives this procedure, you will accept the right decision to use the service. Harm she definitely will not apply.

Publication date: 19.04.2006.

Recently, many clients "Tryska.ru" before visiting the tires ask us questions: "What is better to pump: air or nitrogen? Does anything pumping tires nitrogen? Is it worth spending extra money on this procedure? And is it possible to really notice the difference on an ordinary car? "

We will try to help you understand these not very simple questions.

This service in tires appeared relatively recently and, according to sellers of this service, after downloading nitrogen, the important technical characteristics of the tire are noticeably improved (the stability of the tire pressure, reduced explosion hazard, slow-aging tires, etc.). In order to understand how true these statements are correct, refer to physics and look through each item separately.

At first for reference:

Air itself consists of 78% nitrogen and about 21% oxygen. A nitrogen in tires used in tires contains about 95% nitrogen and 5% oxygen. Those. In our tires, pumped up "in the old manner", and so almost eighty percent of nitrogen, and it is not necessary to talk about any cardiac changes in tires after downloading 95% nitrogen.

But start in order:

Approval 1. Improving the stability of the tire pressure. The thermal expansion coefficient of nitrogen is much less than that of air, and therefore, when the tire is heated, the pressure is practically not changed.

This statement contradicts the laws of physics, namely: Charles's law (gas pressure in a constant volume is directly proportional to the temperature) and the law of gay-loustade (the coefficient of volume expansion of all gases of the same), which we passed in the 9th grade of the secondary school.

Physicists can be believed, and therefore it is impossible to believe "sellers of services".

Approval 2. Checking the tire pressure is three times less often. Due to the fact that the nitrogen molecules are greater than oxygen molecules, the wheel slower slows down.

Nitrogen molecule 3.1x10 ^ - 8 cm, and oxygen molecule 2.9x10 ^ - 8 cm. Those. Oxygen molecule is 6% less than nitrogen molecule. And considering that in the air, which around us is only about 21% oxygen, and the remaining 78% nitrogen, it turns out that the difference in leakage is very insignificant (about one percent).

In fact, modern (if they are working) keep pressure for years. And if there is a problem in the bus, i.e. It is notchomech, it does not matter whether nitrogen is silent in the tire or with oxygen impurities - the tire will still drop.
In addition, clause number 2 is contrary to the rules of operation of the car: the tire pressure must be checked regularly!

Approval 3. Reducing the likelihood of the explosion of the tire. Nitrogen is an inert gas and does not support combustion.

The tire does not "explode", as we imagine it, and burst. Those. The sound that we hear is a sharp loss of pressure in the tire, caused, as a rule, by hitting the car for an extraneous object or the destruction of the construction of the tire itself. In Formula 1, they pump nitrogen into the tires primarily for fire safety. Pure nitrogen during the damage to the wheel, leaving the tire, does not really contribute to the burning.

Approval 4. Preventing the aging of the tire and corrosion of the disk, because There are no moisture, oil, dust, particles that reduce the durability of the wheel.

Tire aging mainly occurs outside the tire, since besides oxygen, solar radiation and other harmful effects (reagents, bitumen, etc.) are on the tire. The corrosion of the disc from the inside is really decreasing due to a smaller amount of oxygen in the bus. But it is worth noting that the tires and discs are still mainly spoiled outside, although some share of nitrogen use is present.

There are other dubious statements, many of which contradict the laws of physics, but there is no particular sense to comment on them. Therefore, summing up, we can say: the majority of theses that are advertised are not consistent. And some are just a frank deception.
Although there is a psychological factor - people who have spent their money and pumped tires with nitrogen, often say that the car has become noticeably softer, quieter and better managed ...

And if you want to check the laws of physics at your own expense, then please you can pump winter or nitrogen. But still there is one really positive moment in this procedure, and this can be said for sure, it will not be worse!

On some tires, drivers offer a service for filling tire nitrogen instead of ordinary air, as it has many useful properties, because of which the operation of the vehicle becomes easier, more comfortable and safer. Of course, this service costs significantly more than a simple paging of the wheels from the compressor, however, following the trends of time, many motorists agree to this service and leaving a hundred with cylinders with full of this flying gas.

Tire pumping with nitrogen is a global trend of filling the tires with a novice-air mixture instead of ordinary air. This method originated on the races of Formula 1, when, to increase the efficiency of the car, its tires were filled exclusively with this mixture, and the pilots did not have it as one of the advantages for the desired victory.

Pumping tire nitrogen

Further, this method was carried to conventional cars of the tire masters from the United States a few more decades ago. And recently, he came to our country, many masters willingly offer such a service to their customers during the maintenance of vehicles.

Why do the wheels swing nitrogen and how does this affect the operation of the vehicle? According to numerous experts around the world, this service has the following benefits before filling the cylinders with ordinary air:

• The physical properties of nitrogen do not change its volume under the influence of the temperature difference, the pressure in the tire, regardless of the time of year, remains unchanged, which allows you to maintain the same speed and fuel consumption.
• Nitrogen molecules are somewhat larger than air, and also have less volatility. This leads to the fact that the wheel must be done much less often in the absence of spoins or defects nipple.
• Due to the fact that oxygen is an oxidizing agent, it gradually corps the rubber from the inside, and the nitrogen of this property does not have, because of which the wheels, pumped by this gas, will serve significantly longer, especially with a neat driver ride.
• Nitrogen has a smaller density than the air mixture, because of which the tires weigh less, and this is especially important in the rally competitions, where the thousandths of seconds have a value.
• During a long ride at high speed, the wheel is characterized by heating, but with the right-handed nitrogen, heat removal will be more efficient, and the probability of overheating of the rubber is significantly lower.
• Nitrogen can never ignite or support combustion, so when a fire is in a car, the probability of an explosion is reduced.

Skeptics believe that many of the above nitrogen properties listed above are greatly exaggerated, and in fact, things are completely different. However, this is not the case, and the effect of each of these properties takes place, albeit in very small, sometimes invisible scale.

Negative sides of injection wheels nitrogen

In pumping tire nitrogen there are pros and cons. What to do the driver to which this service is offered at the maintenance station? Of course, only positive parties this method cannot be limited, and as a result, it is not so effective as it may seem from the words of consultants. Thus, the main disadvantages of injury to nitrogen, which are a reality of life and based on scientific facts and many years of driving practices by professionals, are listed in the following list:

• The cost of the procedure, since when pumping the wheels with the air mixture, it is injected with a compressor directly from the atmosphere, which reduces the cost of the service to almost zero.

As for nitrogen, it is almost impossible to extradite it in domestic conditions directly from the surrounding air, despite the fact that it prevails in the chemical composition of the earth's atmosphere. Thus, it is produced in laboratory conditions, they fill the cylinders and deliver them to the place of implementation by order of the seller.

All these procedures are very noticeable, and considering the commercial interest of masters for a hundred, on the customer's pocket there is a fairly high price for a simple injection of the wheels, and it often repels motorists.

• The second important problem is that with the protruding nippele or a different reason for the loss of pressure in the wheel, pull up it directly on the road with a portable car compressor, of course, you can. But the entire positive effect of nitrogen inside the wheel will be immediately lost.

In order for this to be not, the compressor should have a special adapter to switch the gas supply source from the atmosphere to a cylinder with nitrogen, and it should also be in the car enthusiast arsenal.

Avoid such drawbacks for the driver, who decided to fill its nitrogen wheels, almost impossible. He will only come to terms and more carefully control the risk of gas leakage from its tire, checking the health of the nipples on each wheel, as well as the integrity of the rubber.

Myths and reality Podkachka Nitrogen

Each car enthusiast, who knows this method of swing tires has a certain opinion about this, and it does not always coincide with the facts advertised by consultants in service centers. So, numerous feedback drivers about the use of nitrogen in the tires of their own cars are talking about the following facts and myths:

• Why do the wheels pumped by nitrogen and how effective is it? There is an opinion that the driver when driving on tires, the pressure in which was created with nitrogen, will experience more amenities than the one who uses ordinary air. Yes, indeed, the same pressure created by nitrogen will somewhat mitigate the vehicle's depreciation, but this factor is almost impaired. If the driver is asked inside the wheel air pressure not 2.2 atm., As it is spelled out on the verge of a driver's seat, and by 0.05 atm. Less, the effect will be absolutely comparable.

• Also, experts argue that Nitrogen greatly facilitates the car - yes, it really facilitates. But the difference in air density in the lower layers of the atmosphere is only 7% different from the same indicator for pure nitrogen, as a result of which even 50 liters of air on all wheels of a passenger car, the mass difference will be the hundredths of one gram, and for a car weighing in 1.2 tons it is meager.
• Formula 1 cars are hampered by nitrogen due to the ingrediation of this gas, as it is believed that it is safer to drive. However, as a rule, the racer dies or gets injury not from fire in the tires, but from loss of control due to tire rupture, and this can occur both with air mixtures and with nitrogen inside the wheel.
• Regarding a more rare podachka, you can also argue, since a high-quality tire, a good nipple and a calm neat ride make your contribution to holding the air inside the tire, and it is necessary to pump it more than once every 3 months. In the case of nitrogen, this indicator can stretch to 3.5-4 months, which does not compensate for the overpayment for this fashionable method of injection pressure into the wheel.

• For a longer aging, the tire fact is subjected to refuting almost immediately. The fact is that the wheel in a state of rest can be oxidized by air over several decades. However, those people who are pumped in nitrogen tires, as a rule, often exploit the vehicle, exposing the tires of friction from the outside of the road fabric.

Thus, no matter how neatly the vehicle was not exploited, the wear begins always on the outside - when protector with asphalt or other elements of rubber with an aggressive environment. It is this part that will be more quickly in disrepair than the inner layer of the tire.

Based on the factors listed above, it is possible to cite only one completely reliable fact - the tire refueling with nitrogen to some extent affects the shares of the second that sometimes it is very necessary for riders on professional rally, but this is 100% the lots of only professionals.

The same persons who are trying to present these highly specialized methods for injection pressure into the life of a simple car enthusiast, simply lead commercial activities and are trying to give the most efficient advertising campaign.

With full confidence, it can be said that the usual driver who operates its car on urban roads or country tracks that are not confidential to any adverse goals, this service is completely nothing to do. They can always do with the almost free pumping of the beats atmospheric air, which can be done in any conditions - both on the tire terminal, and just on the road with a small household compressor.

At the same time, the level of safety of the driver and passengers on the road during the movement does not depend in any way on what to pump the wheels - nitrogen or air.

Relatively recently, car services began to offer Russian motorists such a service as pumping tires nitrogen. Someone does it constantly, and someone, with caution, belonging to everything new, is in no hurry to apply nitrogen for your car. But probably each driver has many questions.The answers to which we will try to give today. Including, we will tell why you need to pump the wheels with nitrogen, whether it is benefit from it or this is only the notion of marketers and, of course, we will deal with the better air or nitrogen in tires, pros and cons of the latter. And also give existing myths and try to confirm them or refute.

The use of nitrogen to pump tires is popular in the United States and Europe, where this method is used on the "commercial" vehicles - cargo and passenger transportation. Note that standards for mandatory use of nitrogen does not exist None of the countries. Carriers independently make a decision than pumping tires: nitrogen or ordinary air.

But if you look at the story, you can find out that it was originally a nitrogen filled exclusively racing cars and airliners chassis. Active using nitrogen for Formula 1 cars It suggests that this procedure is fully justified. But still, before filling the tires of your car with an air mixture, you need to figure out, and why pumped with nitrogen tires.

By the way, there is no conventional opinion on the feasibility of using nitrogen for tires among drivers and specialists.. Suppliers of special equipment (nitrogen gas generator) and car service staff, where this service is proposed, of course, vividly describe all the advantages of this technology. At the same time, many experts noted that such a service is only one of the ways to pump out money from wallets of gullible car owners. Let's figure out which of these opinions is true.

Used technology

From the school program, we know that air consists of oxygen, carbon, various impurities and nitrogen. And the latter as part of the air most - almost 80%.

So, swing the wheels using the gas generator. The special unit contributes to the preparation of the composition, which consists of 95% of nitrogen. Before he downloads the air mixture into tires, the air is injected into the device. Next, the air mixture is subjected to filtering, which is carried out in several stages, from the air entered into the gas generator, the existing impurities are driven out, as well as excessive moisture. The purified air mixture enters special filters where nitrogen is delayed. As a result, a purified, not containing impurities, a mixture of nitrogen.

By the way, the price of this service for one wheel of a passenger car is about 200 rubles, as for freight vehicles, it increases to five hundred rubles per tire.

Opinion of sellers and marketers

According to supporters of pumping nitrogen into tires, this manipulation gives a lot of advantages. But it is worth exposing these assurances by some doubtFor this, it is necessary to remember the school curriculum and try to understand whether there is a difference in the air and a nitrate mixture. Next, we list the advantages received by the car owner when using a nitrate mixture instead of ordinary air. These arguments are heard by drivers, visiting the car service to swing the wheels.

1. The inner parts of the wheels made of metal are in isolation from corrosive processes that occur when using oxygen.
2. In the process of movement, the car behaves more calmly and retains maximum resistance on the road.
3. In the work of the wheels, with increasing loads or temperatures, noticeable improvements are observed.
4. The driver becomes easier to control his car.
5. When contacting tires with a road surface, the driver feels less vibrations and almost does not hear noise.
6. At the entrance to the turn either, the car is becoming more stable.
7. If you need an extreme start, the smallest slip is noted.
8. Casting pressure will not have dependence on temperature mode, load or speed.
9. Even, moving along an uneven road, a stable smoothness will be marked in the machine.
10. Same and long wear tires.
11. When visiting the border, you will never damage the wheels.
12. Reduced the length of the brake path.
13. Suspension load will decrease, which will entail a significant reduction in overloads.
14. Significantly improves the depreciation of the wheels.
15. In case of overheating or damage, the likelihood of tire fire is reduced.
16. The duration of the maintenance of tires increases.
17. Surrend the safety during the control of the car.
18. The regularity of wheel paging is much increased in time.
19. Maneuverability of the vehicle is improving.
20. The pressure in the wheels is maintained at a stable level.

After such assurances, there is a desire to immediately fill the wheels of your car with this miraculous air mixture. However, do not hurry. Now we will try to figure it out, if everything turns out in reality.

Podkachka nitrogen: fiction and reality

Increased comfort when driving

Some of the above arguments are permissible to associate in one statement: by car, the wheels of which are filled with nitric mixture, it is much more comfortable. This is not quite true. For greater softness while driving it is enough to reduce the volume of the injected mixture of only 0.2 atmospheres.

Reduced loads

Marketers and workers of tire point points say that nitrogen injection in tires reduces the load on the car suspension. It is a myth! Again, contacting the textbook of chemistry, you can find out that the molecular weight of nitrogen is only 7% less than molecular weight of air. And how do you think how much significantly reflects such a slight difference in the total mass of the car? You can declare without oscillations that it is not essential! The weight of the gas in the tires is an insignificant part in the mass of the vehicle as a whole.

Increased safety when driving

Nitrogen in tires contributes to improving security when driving. This is not true again. In fact, the wheels in racing cars are pumped by nitrogen. This is done to reduce possible consequences with probatively inflammation of cars. Nitrogen is an element that is not susceptible to burning. With a traffic accident, it helps to reduce the power of the flame. "Professionals" declare that tires, pumped up with nitric mixture, will never explode. But imagine if the wheel breaks up, then there is absolutely no difference that it was injected into it.

Reducing the regularity of wheel paging

"Sellers of air" is argued that autocoles, pumped up with nitrogen, no longer descend. And again, referring to school knowledge, it can be recalled that the nitrogen molecule in size is much larger than air molecule. But know how the wheel goes down in a natural way! During the year, the pressure indicator in the wheels filled with air drops approximately 0.8 atmospheres. Most likely, nitrogen will "leave" a little less. Although, if you think about the right, then this difference will be not so significant and noticeable..

Reducing fuel consumption

The most important advertising reception: pumping the wheels of the nitrogen mixture reduces the fuel consumption, since the inert gas is somewhat less than oxygen. We talked about the molecular weight a little earlier. And therefore, we are confidently declare that this argument is also myth!

In order to really save fuel, there are other, much more efficient ways.

Stabilization of intraine pressure

In nitrogen, compared with air, smaller volume expansionthan air. Therefore, it helps to achieve a stable pressure of nitrogen to achieve a stable pressure in wheels: nitrogen is not expanding under the action of high temperatures and is not compressed with negative temperature values \u200b\u200bon the street.

According to the Gay Loursak law, this indicator is equal to any gases. The algorithm for the behavior of nitrogen and ordinary air with changes in temperatures is absolutely not different. If you speak the language of numbers, then the difference in this indicator is Only 0.0001 (0.00025 atmospheres), and no instrument that measures intracean pressure will not fix this difference.

Lack of corrosion processes

Air contains natural moisture, which contributes to the formation of corrosion, destroying the cord coverage of the tires. So, the use of nitrogen eliminates corrosion, and the working resource of tires increases.

With a thorough review of this issue, it becomes clear that corrosion processes do not become the main reason for the destruction of the tires. Natural erasing, deformation, cracking - all these processes happen more with the outside of the tire. As can be seen, the auto stroke earlier comes to the unfit state outside.

And even perfect inside the tires, which are worn up the protector or there are cracks, it is impossible to use!

Best wheel grip with expensive

Nitrogen does not have properties to expand and narrow under the action of ambient temperature, and therefore part of the contact of the tire with the road canvase remains stable.

This statement is Absolute absurd, taking into account the lack of differences in gas expansion coefficients (see above). And a beneficial effect on the quality of the clutch of the wheels with an expensive, first of all will influence the tread pattern, the structural features of the auto stroke, the optimal distribution of the load on the wheels of the car and so on.

Output

Download nitrogen into tires, only follows weighing all positive and negative moments This procedure. In practice, the use of nitrogen is a very profitable business, since the profit is literally from the air. Of course, you can personally test the effect of swap, comparing it with existing experience and without deepening in theoretical explanations. We just want to note that there will be no harm from this procedure, but there is no significant change to expect.

In completion, it is necessary to clarify that updated Automotive Tire Nitrogen for Passenger Transport It does not make much sense. In fact, the car owner will not see absolutely no difference. On commercial transport, especially on special hints - fuel trucks and other TS, the meaning in the use of nitrogen is much greater. In this embodiment, the costs of using nitrogen mixture are shifted to the carrier company, and a non-essential safety growth in some conditions is achieved. Although the difference and in this case will be insignificant in real conditions.

Well, of course, to make a decision will be the motorist!

The imposition of useless services are engaged in both the simplest tires and elite car dealerships. As soon as the car owners open their eyes to the next "nano-turbo-super-action" invention, a new product appears, which seems to be something innovative and amazing.

Tire nitrogen has become fashionable in America, when drivers began to desperately equal to Formula 1 racers, which used this composition instead of the usual air. The idea of \u200b\u200blightningly picked up marketers and for several years now successfully sell air for money in the literal and figurative sense of the word. Li nitrogen has such amazing properties or it's just another trick, we will understand the article, simply arranging comparative experiments.

Is Nitrogen affects pressure

Any seller will say that the thermal expansion in nitrogen is much lower than that of free air. Accordingly, according to the "nitric" theory, when heating the wheels, the machine will go softer.

In fact, it is not even one deception, but two more. First, most often in the process of pumping tires with nitrogen, the staff of the car dealership is not strongly trying. As a result, the pressure is fine below (for example, if the pressure is 2.25 atm in the standard tire, then after filling with nitrogen, this indicator may be 1.75 atm). Therefore, it is not surprising that it seems as if the car moves more gently.

The second deception lies in the fact that, according to at least two laws of physics, the nitrogen pressure indicators are directly proportional to the temperature (therefore, when the pressure cannot remain unchanged when heated). In addition, this gas differ from oxygen into such insignificant interests that only highly sensitive equipment can notice the difference. If you bring real figures, the cheating comicness becomes even more obvious. The coefficient of volume expansion of nitrogen gases is 0.003372 (1 / K), and air - 0.003665 (1 / K). Even if there is a strong overheating in the wheel, then the difference will be so meager that it will not be able to fix a single pressure gauge.

If this is not enough, then you can conduct an experiment:

• Take two cars with identical tires.
• To pump the tires of one machine with nitrogen, and the other - air (the pressure must be the same, for example, 1.75 atm).
• Drive on the highway at a speed of 120 km / h to warm up the tires.

In the tire, pumped air after 10-15 minutes the pressure will increase to 1.85 atm. But, the funny thing is that during the experiment and nitrogen indicators will also increase to 1.85 atm.

Interesting! For the sake of the experiment, we put on the roof of two identical machines on the glass of water and erupt them. The liquid will fall out the same amount.

If you measure the temperature of the tires, the air will warm up for 8 degrees, and nitrogen by 7. Again, the changes are almost the same. Only in the first case, the pumping tires cost nothing, but when using nitrogen, only over one tire will have to lay out about 200 rubles.

Is there no gas leak no

First of all, remember the school and that the air on ¾ consists precisely from nitrogen (that is, by 78%). In turn, in the car service and at refueling, a mixture of 95% nitrogen and 5% oxygen is offered. However, you can only check the seller for honesty if you give gas from the tire to the laboratory. As a rule, according to the results of the study, it turns out that there are no 95% nitrogen in an expensive mixture, and only 84% of this gas and 16% oxygen. The difference between free air and the new product becomes even less (only 6%). Can a man notice it or the tire itself? Of course no.

But, after all, in the car service, it is argued that nitrogen molecules are much more than at oxygen, so they disappear slower. Yes, the diameter of the nitrogen molecule is actually more by as much as 6% (0.32 nm against 0.30 nm). This means that if the tire in which nitrogen was injected during operation of the car will lose 1 atm, then the air will be released about 1.012 atm. Another striking difference, which of course will affect the controllability, fuel consumption and on how the driver feels.

Even if we assume that oxygen will completely come out of the tire chamber, then it will remain clean and most importantly free nitrogen. You can open your tire workshop and sell it!

Isn't Nitrogen prolongs the life of the tire

Advertisers argue that from the inside the tire must be protected from hazardous oxygen and only nitrogen can cope with it. Sounds beautiful, but what about the air, which is located outside? What about reagents and sunlight? If you find the first old tire on the landfill, it will be obvious that the destruction is not from the inside, but outside. Accordingly, nitrogen does not protect it.

Useful! Perhaps the only truthful statement is that corrosion inside the disk develops faster under the influence of more oxygen. But, alas, if it was formed outside, it will still lead to the destruction of rubber.

If there were still doubts about whether it is worth punishing the tires with nitrogen, consider the rest of the myths that sellers about this gas compound.

What is not true

Unfair sellers go to everything to make money out of anything, so they come up with the most ridiculous quality for nitrogen:

• The mass of the wheels is becoming less. According to legend, this leads to the fact that shock absorbers wear out longer, and fuel consumption decreases. In fact, all this is another "PSHICK". The air density is 1.29 kg / m3, and nitrogen is 1.25 kg / m3. If you do not go into calculations, then paying 200 rubles per wheel, the driver gets a tire, which will weigh less than 2.4 g. With shoes in the salon and then more than the sand.
• Tires do not have to pump. In this case, it all depends not from the fact that inside the chamber, but from the "freshness" of the tires. If the wheels are old, then be there at least the breath of the ponies, they will still gradually be blown away. And if you put new tires, they will not require podachts after the same time with air or nitrogen.
• The noise level decreases. We will conduct an experiment. We accelerate to 100 km / h, turn off the radio, the ventilation system and tightly close the windows. Turn off the transmission and engine. Measure the indicators: Nitrogen - 65 dB, at the air - 68 dB. Do you think the difference in 3 dB can notice the human ear? Accordingly, this is another lie.
• Wheel will not explode. It is able to break only with high overload, which is simply impossible to achieve, traveling on a passenger car. And the air inside the tires or nitrogen is not important, the probability of the explosion will be equal to almost zero.

Interesting! After downloading nitrogen in the tire workshops on the tire even screw the special green cap. This, according to employees, is necessary in order to do not accidentally filled with oxygen in the other hundred chambers. This creates the imitation of the fact that nitrogen is something unique.

In custody

What about the races of formula 1? These guys pumped with nitrogen tires, because during the competition, each for a second is important. Therefore, even if the car is easier for several grams, it can be very helpful. And the usual car owner of nitrogen in tires does not bring absolutely nothing but cash spending.