Anyone who has ever flown on a passenger plane knows that there are oxygen masks above the seats, which in emergency situations themselves fall out of their niches. Flight attendants talk about this before every flight, and it can be seen on schematic images in airliners. But few people know that oxygen masks are not connected to oxygen cylinders and save the lives of passengers on a completely different principle: an unexpected blow, shaking, flashing lights, the sound of a siren and oxygen masks falling directly from the ceiling are like air. accidents are depicted in Hollywood films. It is quite logical to assume that somewhere in the bowels of the airliner there are oxygen cylinders connected to these same masks. But everything is much simpler, safer and more efficient. Everyone knows from school that as altitude increases, pressure decreases. Already when reaching 4 thousand meters, the air is so rare that it becomes very difficult to breathe, and for people with poor health this is completely impossible. Therefore, when the aircraft cabin depressurizes at an altitude of 4 km and above, equipment that ejects breathing masks is automatically turned on. There is always at least one more mask than there are seats in a row. This is because designers anticipate that during an emergency there may be passengers or crew in the corridors who also need to be supplied with oxygen. But the ingenuity of flight safety engineers doesn’t end there. It turns out there are no oxygen tanks on the plane. To provide vital gas to 200-300 passengers, you will have to carry significant supplies of gas with you during the flight. This would increase the aircraft’s take-off weight, reduce the payload and increase fuel consumption. Of course, dozens of oxygen cylinders are a source of increased danger, so a simple but elegant solution was invented – oxygen for masks is produced, as they say, “on the spot,” that is, at the moment when it is available. The required gas is released as a result of a simple chemical reaction directly above the heads of the passengers. Everything necessary for oxygen production is located next to the mask and when the system is activated, the reagents immediately begin to mix. Those who have encountered emergency situations on airplanes have noticed a burning smell that appears simultaneously with the masks falling out. Many people start to panic even more because of this, but this is not worth doing, because this smell is simply a side effect of a chemical reaction, and not a sign of a fire. Of course, the possibility of using oxygen. A mask is a minor emergency because air travel is still the safest in the world and walking on the street is much more dangerous than taking a transatlantic flight.
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