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0 pointsjahewson3y ago0 comments

Can be used to clear the cabin of smoke in the event of a fire.

0 comments

userbinator3y ago

Or in case of overpressure, which can be just as bad.

Grimburger3y ago

You sure about that?

Humans regularly work at 30x atmospheric pressure and can probably go to 100x

https://space.stackexchange.com/questions/32640/what-is-the-...

mattashii3y ago

I don't think airplane hulls are designed for more than 1 Atm of pressure differential between cabin and the outside; according to the wikipedia article [0] on cabin pressurization normal values are between 540 and 690 hPa pressure differential are normal.

If the cabin has an overpressure event, the hull might pop like a balloon, leading to a decompression event.

[0] https://en.wikipedia.org/wiki/Cabin_pressurization

userbinator3y ago

Exactly. The humans aren't the problem, it's the plane itself.

afterburner3y ago

These seem to talk mostly about diving, where you breathe from a regulated air supply. I assume that air supply is not at 30-100x atmospheric pressure?

bboygravity3y ago

If the air supply wouldn't be at a slightly higher pressure than that, the air would get sucked out of your lungs as far as I understand.

This is why dive tanks run out way way faster the deeper you go (around 1 hour at 18 meters deep and around 10 minutes at 30+ meters out the top of my head).

heavenlyblue3y ago

Air supply is at that pressure, but they don't breathe the same mix as atmospheric air. Atmospheric air becomes narcotic at 4 atmospheres.

Grimburger3y ago

The air is at that pressure, as is the surrounding water pressure on the human body.

We are remarkably good at handling higher pressures.

j / k navigate · click thread line to collapse

0 comments

userbinator3y ago

Or in case of overpressure, which can be just as bad.

Grimburger3y ago

You sure about that?

Humans regularly work at 30x atmospheric pressure and can probably go to 100x

https://space.stackexchange.com/questions/32640/what-is-the-...

mattashii3y ago

If the cabin has an overpressure event, the hull might pop like a balloon, leading to a decompression event.

[0] https://en.wikipedia.org/wiki/Cabin_pressurization

userbinator3y ago

Exactly. The humans aren't the problem, it's the plane itself.

afterburner3y ago

These seem to talk mostly about diving, where you breathe from a regulated air supply. I assume that air supply is not at 30-100x atmospheric pressure?

bboygravity3y ago

If the air supply wouldn't be at a slightly higher pressure than that, the air would get sucked out of your lungs as far as I understand.

This is why dive tanks run out way way faster the deeper you go (around 1 hour at 18 meters deep and around 10 minutes at 30+ meters out the top of my head).

heavenlyblue3y ago

Air supply is at that pressure, but they don't breathe the same mix as atmospheric air. Atmospheric air becomes narcotic at 4 atmospheres.

Grimburger3y ago

The air is at that pressure, as is the surrounding water pressure on the human body.

We are remarkably good at handling higher pressures.

j / k navigate · click thread line to collapse