Why is there a small hole in an airplane window?

Attentive friends will find that there is a small round hole under the glass window of the plane, what is this small hole for? Aren't you afraid that the air currents will shatter the glass?

Why is there a small hole in the glass of an airplane?

This small hole is called a vent and its main function is to protect the safety of passengers. The vents are generally designed at the bottom of the window.

When the pressure inside the aircraft is too high, the internal air pressure can be discharged to the outside of the window through the air vent to ensure that the window will not crack due to the air pressure. With the protection of the air vents, the air pressure inside the passengers and the aircraft will be relatively stable, and the safety of the entire cabin can also be ensured when the aircraft enters the high-altitude flight. Therefore, the air vents on the aircraft have a very important role in the aircraft.

Personally, I think the design of the vent is a very good invention. Because the air vents can help improve the safety of passengers, and can also help the aircraft adjust when the air pressure is too high, ensuring the safety of the whole flight. In the early development of the world's aviation industry, due to the instability of air pressure, many air accidents occurred, so in order to reduce the occurrence of air accidents, people made a lot of changes to the aircraft, that is, in the process of continuous change and improvement, the appearance of air vents improved the survival rate of aircraft.

The following is a brief introduction to the measures to avoid danger when flying on an airplane.

First: Fasten your seatbelts.

If you are flying by yourself, you must fasten your seat belt in case of danger to prevent yourself from being injured due to turbulence during the flight. Many passengers just don't wear seat belts, resulting in many dangerous situations in air crashes again and again.

Second: prepare your parachute.

In fact, preparing a parachute is also a means of avoiding danger, which often happens to fighter pilots, because preparing a parachute can save themselves by ejecting the seat. Such a situation is not common on private airliners, but it is also a means of hedging, and in some special cases, it can save one's own life.

Third: Obey the command.

Once the plane encounters an emergency, it is important not to have panicked thoughts and emotions. Because this will make you useless, and even increase your chances of danger. Be sure to follow the arrangements of the maintenance staff, so as to ensure your chances of survival.

Fourth: Call for emergency help**.

I think the most important thing is to call emergency help**. Because after a dangerous accident, dialing emergency rescue** can send a distress signal to the outside world, and when the outside world receives a distress signal, it will make the first response. In a short period of time, you can get help and buy a little life for your life.

To sum up, it is very convenient to fly now, but it is also necessary to ensure safety while flying by yourself. Because only safety is the premise of everything, many people still have careless thinking, which is unacceptable. Safety is the most important thing in everything you do.

The glass holes on the aircraft windows are actually small air holes, and there are two main uses:One is to balance the air pressure, and the other is to prevent the glass from fogging.

Frequent flyers will probably notice this small blowhole, which is usually located at the lower edge of the glass window, in an inconspicuous position. This principle is actually quite simple, everyone can figure it out with a little physics-related knowledge, and this small pora is still very necessary.

1. Balance air pressure

When the aircraft is raised to flight altitude, this small hole can reduce the air pressure difference between the inside and outside of the cabin to a certain extent.

During the flight of the aircraft, as the altitude continues to rise, the air pressure in the external environment will become higher and higher. In order to protect the lives of passengers, the cabin of the aircraft must be pressurized.

When the aircraft is at an altitude of 10,000 meters, the outside air pressure is only a standard air pressure. In order to achieve a standard air pressure that is suitable for the human body at such an altitude, it is necessary to subjecte the body to a higher pressure. However, if the internal and external materials of the aircraft are simply used to withstand such air pressure differences, then the manufacturing cost of the aircraft will be greatly increased.

Experimental studies have found that the air pressure does not have a significant effect on the body after reaching a standard air pressure, and the aircraft has a very complex pressure control system inside, and the exhaust hole at the lower edge of the aircraft window is part of the pressure relief system.

2. Prevent the window glass from atomizing

Not only is the air pressure difference between the inside and outside of the cabin very large, but the temperature difference is also very large. When the plane reaches an altitude of 5,000 meters, the surrounding atmospheric temperature drops to about minus 15 degrees, and when the plane reaches an altitude of 10,000 meters, the atmospheric temperature is around minus 40 degrees.

The temperature difference between the inside and outside of the cabin is enough to make the window panes completely frost and nothing can be seen.

When the temperature difference between indoor and outdoor is large in winter, it is very easy for indoor glass to form ice window flowers, which is the same principle as aircraft atomization. It is easy to solve this problem by opening a small hole under the aircraft window glass to allow the internal and external airflow to communicate, and the air communicating with each other can effectively avoid the atomization of water vapor due to excessive temperature difference.

Of course, the reasons for this are ancillary reasons, but the most important point is the first point, which is to balance the internal and external air pressure.

In fact, the aircraft glass window is a three-layer mechanism, and the small hole we see is at the lower edge of the middle glass. The innermost layer of glass is not sealed, while the outermost layer of glass is tightly sealed. The main purpose of the small holes in the glass window is to maintain the pressure difference between the outer glass and the inner layer, and if necessary, the pressure can be relieved slowly.

At the same time, it also serves the purpose of avoiding fogging up the entire window, so that passengers can enjoy the beautiful view outside the window at any time.

This is decompression, this is decompression, if this inside and outside suddenly pressure is suddenly high, this glass will break.

One is to balance the air pressure.

When the aircraft is raised to flight altitude.

This small hole is able to reduce a certain air pressure difference between the inside and outside of the cabin;

The second is to prevent the window glass from atomizing.

Under normal circumstances, I think that this small hole in the glass window of an airplane will be used to vent air.

The small round hole in the airplane window is officially called "breathing hole", and its role in the airplane can balance the pressure of the inner and outer layers of the window, in order to prevent the window from cracking due to drastic changes in temperature and air pressure. The small round hole balances the air pressure in the middle and outer glass and the cabin, preventing the inner glass from bursting and ensuring that the pressure in the cabin is only applied to the outer glass during the voyage.

Another function can prevent condensation of water vapor in the window, and prevent moisture and fogging; Airplanes fly at altitudes above 30,000 feet, and the temperature outside the cabin is often below -50. Without the holes, the moisture exhaled by passengers in the airport will frost on the windows (like the windows of a car in winter). The internal and external pressure can be adjusted through the breathing hole, which can avoid the generation of water vapor and ensure that the scenery can be clearly presented.

Why is there a hole in the window of an airplane? Aren't there safety hazards?

In fact, the holes in the windows of the aircraft are more precise, and when the pressure inside the aircraft changes, the pressure between the two layers of glass inside the window (which is not actually glass) is balanced to prevent the internal glass from breaking due to excessive pressure changes. Because the hole in the window of the aircraft is actually a drain valve,It not only balances the pressure between the cabin and the middle and exterior windows, but also eliminates fog and frost.

Aircraft glass actually has three layers. The aircraft is flying at high altitudes, the external pressure is low, and the internal pressure of the aircraft is almost normal. So there's a big gap between inside and outside.

The outer glass is very strong and will not be affected by internal and external pressures**. The glass in the middle is not as strong, so make a hole in the glass so that the pressure inside and outside is the same to prevent bursting.

This small hole is meant to equalize the pressure inside and outside the machine. To prevent aircraft windows from cracking due to drastic changes in temperature and pressure, aircraft windows are usually made up of three layers of different materials with a small hole in the middle to equalize the pressure inside and outside the machine. Officially known as the "breathing hole", this small hole is used to regulate the pressure between the inner and outer window panes.

To put it simply, this system, which has small holes as one of its components, ensures that the material outside the aircraft is subjected to maximum stress, so even if something happens, it adapts to ensure that you can continue to breathe in the cabin. The structure of the aircraft window (composed of three layers of different materials, the middle layer opens a small hole for passengers to reach), and the outermost two layers are structural layers.

At the same time, this small hole also has a way to prevent water vapor condensation in the window. Airplanes mostly fly at an altitude of more than 3,000 feet, so the temperature outside the plane is often lower than minus 50 degrees Celsius, if there is water, the windows will be fogged and frosty, and the pressure adjustment through the breathing holes can avoid water, and the breathing holes can also play the role of wet fog, so that you can see the scenery from the cabin is always so clear. Therefore,Small holes in the aircraft play an important role in promoting air circulation.

Because when the aircraft flies to a certain altitude, the air pressure inside the aircraft is not the same as the air pressure outside the aircraft, so this small hole is to balance the air pressure to reduce the air pressure difference between the inside and outside of the cabin, and secondly, to prevent the phenomenon of fogging in the glass window.

This small hole was designed to prevent atmospheric pressure from affecting the passengers in the plane.

In this way, the flight safety can be guaranteed, and the air pressure can be more balanced. It also prevents the glass from fogging.

The small holes in the windows of airplanes serve two main purposes. The first is to balance the air pressure. When the aircraft is raised to flight altitude, this small hole reduces the air pressure difference between the inside and outside of the cabin.

The second is to prevent the window panes from fogging. The small hole can avoid fogging up the glass of the aircraft window due to various reasons such as air pressure in the air.

An airplane is a heavier-than-air aircraft that has a power plant with one or more engines that generates forward thrust or pull, and lift is generated by the fixed wings of the fuselage, and flies in the atmosphere.

The airplane is one of the most significant inventions of the early 20th century, recognized as invented by the American Wright brothers. The advent of airplanes changed and affected people's lives, and started the history of people's conquest of the blue sky.

Aircraft can be divided into two categories: military aircraft and civil aircraft according to their use. Civil aircraft generally refers to all aircraft for non-military purposes, such as passenger aircraft, cargo aircraft, agricultural aircraft, sports aircraft, ambulance aircraft, experimental research aircraft, etc. Content.