When flying on airplanes, you've probably noticed tiny holes in the windows. They are called breather holes and allow the pressure between the outer and inner panes to equalize.
The window consists of three layers: a double-glazed unit and durable plastic that protects it from damage from inside the cabin. The layers of the double-glazed unit fit snugly against each other, with a small amount of air between them.
Without the holes, the window could crack during takeoff or landing. The holes also act as protection against fogging, allowing air to pass through and preventing condensation.
When flying at high altitudes, the outer layer of the window cools to extremely low temperatures, and if it weren't for this hole, the warm and humid air in the cabin would condense on it as moisture. The hole is not continuous, so extremely cold air from outside does not enter the cabin.
In addition, the holes in the windows have been enshrined in safety standards: they appeared back in the 1950s, after three aircraft crashed due to depressurization. Now, windows on all passenger aircraft are equipped with holes.
Earlier, www1.ru also reported that titanium parts for the wing of the new MC-21 aircraft have begun to be produced in Ulyanovsk
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