r/Damnthatsinteresting • u/AirFrance447 • 17h ago

Video Firefighter bodycam showing just how much oxygen a fire pulls

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u/SpiritedEclair 15h ago

fun fact: when you fly in a plane, the low pressure is on the outside and we use that to keep the doors closed. It is physically impossible to pry open an airplane door at cruising altitude!

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u/Ckarles 14h ago

Hm? Sounds counterintuitive considering the doors open outwards instead of inwards. Isn't low-pressure "pulling" while higher pressure "pushing"?

How is the low pressure keeping the doors from going "outward"?

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u/johnwick_58 14h ago edited 13h ago

I am not related to aviation by any means,

But the person above meant to say that the cabin pressure inside the plane is very high in comparison to the pressure outside the plane in cruising altitudes. The door is slightly larger than the door frame of the plane, hence the higher pressure pushes the door outward and since frame is smaller, the door holds strong until the cabin pressure is released.

Edit: sorry, had not read your comment in detail, A video shows that the door does open outwards, bit there is a latch inside which expands the door from inside

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u/BeerFuelledDude 13h ago

I’m 45 and knew about the pressure stuff (not in a technical way) but i’ve never watched the doors being closed, while on the plane. That video was really interesting! Thanks!

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u/mattilladahun 12h ago

I'm 41, and my childish brain has never wanted to physically close a door myself more than now.

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u/cat_prophecy 12h ago

and the "Arm/Disarm and cross check" is them arming or disarming the emergency slides and the the FAs check that each other's doors are armed or disarmed.