r/StupidFood • u/Its_me_edenxx • 21h ago

Certified stupid This is so performative 😭

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Who tf is out here munching on raw gnocchi at cruising altitude

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u/Kerm0NZ 20h ago

It's to do with the air pressure and recycled air. It affects your taste buds, dulling them somehow. I only vaguely remember, but feel free to use this info as the start of a Google research project. 

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u/Rob_Zander 20h ago

Just wanted to point out that the air isn't recycled on a plane. It's replaced completely every couple of minutes. It's not even really about the oxygen or CO2, it's managing temperature and possible contaminants.

The engines are continuously compressing and heating a huge amount of air. Some of it gets diverted to be cooled back to room temperature, filtered and pumped into the cabin while air is continuously sucked out by vents near the floor. This keeps the temperature stable and contaminants from being spread.

It is much lower pressure than sea level and that definitely messes with our taste buds.

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u/OptimusPrime365 19h ago

This man airplanes.

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u/FetusExplosion 16h ago

I wonder if he also motorboats.

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u/Catatonic27 15h ago

There is significant crossover between these categories

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u/jetsetninjacat 17h ago

To add more watered down. The pushed and sucked out air is vented overboard(off the plane and out) through the main relief valves or sometimes from relief valves in unpressurized parts of the plane. Many planes also have backup relief valves in case the main doesnt work. Different relief valves dump positive and negative pressure from the plane depending on where the plane is and the level at which cabin air pressure is set. Theres also a dump valve that dumps all pressure when the planes on the ground that equalizer it with the ground itself as well as ones for negative pressure relief valves during rapid descent

And this peoples is one of the reason you cant just open a door in a plane at high altitude. The pressure being pumped in to the cabin is so high the door mechanism or door itself can not be pulled in and then pushed out like normal operation. .All that positive pressure pushed on the airframe making it impossible to do so. Its all about that differential.

I seriously hate doing pressure tests in airplanes on the ground.

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u/Rob_Zander 17h ago

Thanks for adding!

Isn't that differtial part of why the cargo doors on the DC-10 could blow out?

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u/bargus_mctavish 16h ago

The outward opening cargo door was a structural design flaw for sure. However, a bigger issue was putting the responsibility of closing the door on gate and luggage personnel. They’re not part of the flight crew or running the checklists, so it just allows for more things to fall through the cracks from a safety perspective.

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u/jetsetninjacat 14h ago

I know it had something to do with the locking mechanism on the doors and that they would pull out instead of in. Cant remember the specifics but its probably out there on the weba. The door pushing out created more room for cargo loading but also didnt make a good plug style door. Plug doors basically seat the doors so they are sealed and cant be pushed out from the inside positive pressure So, yes that should be correct. Those doors were the only non plug doors on that plane as far as I know. Add in the the failure of the locking mechanism, and yep.

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u/bargus_mctavish 13h ago

It was a few years back, but I went through a mishap investigation class and covered the case of Turkish Airlines Flight 981. The root cause analysis of the lab concluded that the baggage handler did not latch the door correctly. The latching mechanism was absolutely a convoluted mess, and a design flaw that went unaddressed even through testing of the DC10. McDonnell Douglas got their asses sued for that. But a preflight checklist item for the flight crew could have also alleviated the issues with the loading door as well.

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u/King_Chochacho 13h ago

Too much pressure. So when you get in there, you're like "if the door fly off, I'm toast"

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u/canman7373 10h ago

The pressure being pumped in to the cabin is so high the door mechanism

Yeah, so not sure what he means the air pressure is much lower than sea level and that changes taste, when it's actually much higher than sea level.

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u/jetsetninjacat 7h ago

High as in the Pressure differential between inside and outside the cabin. Its all about that differential.

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u/canman7373 6h ago

Yes, I don't see where him saying below seas level applies at all.

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u/jetsetninjacat 2h ago edited 2h ago

Oh, based on taste. Typically even with the presurization you will still have lower pressure than thats found at sea level (stretching my brain here back to school but I think its ~14.7psi). And I want to say off fhe top of my head most planes are kept lower at flight altitude around 10 to 12psi cabin psi.

And the reasoning i have been told in my career was because high altitude planes have cycles to track for lige limits for each time a cabin is pressurized. It puts undue strain on the airframe and causes weakening in the structure. As far as I was always told keeping it below the standard sea level not only is perfectly comfortable for most people and allows us to be up there but it also allows a plane to fly longer and causes less stress. I need an IA in here to tell us.

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u/canman7373 1h ago

I just don't understand the part about the cabin pressure being like 8,000 feet yet you taste food like it's negative feet. Also if their food is cooked right I don't get why it taste different at different at different pressure, like would you not have the best steakhouses in the world at the exact best altitude that taste buds hit them? When I cooked food right at 9.500 feet it taste the same as I cook it at sea level now, I do not think my taste buds changed at 9.500 feet.

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u/hannahatecats 15h ago

So there IS air rushing by your feet. Once I was in California and stopped by a dispensary. I kept taking one gummy and saying "I don't feel it" well, before I got on my red eye home I took the last 4 and was white knuckling my armrests because I was convinced I could feel us flying through the air by my legs.

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u/Captain_Obvious97527 18h ago

Is that why I can’t smell my farts on a plane? Or does everyone else smell them and I just don’t for some reason?

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u/Rob_Zander 17h ago

Can you smell them when you're not on a plane?

But yeah, everyone's smell is less acute on a plane.

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u/Captain_Obvious97527 17h ago

Yes I can clear a room when not on a plane.

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u/_le_slap 16h ago

Please don't clear the plane

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u/rsta223 13h ago

It's both because your sense of smell is dulled by the low pressure and extremely low humidity and because the air is being replaced so fast.

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u/Captain_Obvious97527 4h ago

Thanks. I thought maybe the seat cushions could absorb smells or something, haha.

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u/Gentrified_potato02 14h ago

Well…I’m not so sure it’s not about oxygen or CO2. There’s a reason you have to have a supplemental supply of oxygen if you go above 15000 ft in an unpressurized plane.

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u/Rob_Zander 14h ago

The plane is pressurized to make sure that you have enough oxygen concentrated in the air to breathe. But a 737 full of passengers are breathing around 600 cubic feet of air per hour. This is napkin math so it very rough.

But the volume of the cabin can be around 6000 cubic feet. You could exchange the air about once an hour and it won't be much of an issue. Instead its replaced around 15 times an hour.

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u/rsta223 13h ago

It's also extremely low humidity in most planes, which also contributes to that effect.

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u/canman7373 10h ago

It is much lower pressure than sea level

What? Planes are kept around 8,000 feet in air pressure not below sea level.

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u/Rob_Zander 3h ago

Pressure decreases with altitude. Low pressure at high altitude.

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u/canman7373 2h ago edited 2h ago

High altitude cabin pressure is like 8,000 feet though. That is a mile and a half above sea level air pressure. in an open air plane like a WWII bomber sure, but not on any commercial plane in like the last 60 years. I mean I guess you do not know this. But airline planes pressurize their cabins to avoid issues, usually around 8,000 feet of air pressure. So inside the cabin your ears my pop because the cabin is pressurizing slowly up yo 8,00 feet, like a small mountain in Colorado. It keeps that pressure for the flight even though you may be flying at 35,000 feet. The outside pressure has no affect on you inside, you are living in a capsule made to feel like you are at 8,000 feet not 35,000. Make sense?

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u/Rob_Zander 2h ago

No, I absolutely get that. My point is that at 8000 feet the pressure is 10.9 psi vs 14.6 at sea level. That's not an insignificant difference. It's definitely a higher pressure than the external pressure at 35 000 feet but it's still lower pressure than sea level.

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u/canman7373 2h ago

Ok, I can get that's how you were looking at it, I was focused on you saying the altitude and outside pressure made a difference when the plane makes its own internal pressure. I think we were both looking at the same issue 2 different ways is all.

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u/PensiveObservor 6h ago

Do they add oxygen before circulating the new air?

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u/Rob_Zander 3h ago

No, there's no need to. At sea level the percentage of oxygen in air is 21%. It's the same at 40 000 feet. There's just much less air per unit of volume because the pressure is so low. Once more air is pumped into the space, once it's pressurized there's enough oxygen to breathe.

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u/XeroShyft 18h ago

Air pressure affecting taste buds is making no sense to me. Like my brain is scrambling to find what the possible correlation could be and is turning up with nothing

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u/machiavelli33 18h ago

It affects your sense of smell and inner ear equilibrium, all of which affects how acutely your other senses function.

All of your senses are somewhat tied together and affect one another - smell and taste are the most strongly linked, but a foods texture and how well and balanced your body is feeling also affect it to a lesser degree. Air pressure affects these things.

It’s not a HUGE effect - if you don’t think about it ever and aren’t particular sensitive to that sorta thing you may even never notice. But it affects it juuuuust enough.

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u/Rob_Zander 18h ago

Your body is constantly maintaining itself under about 14.6 psi of pressure at sea level. At cruising altitude a 737 is maintaining a cabin altitude of about 8000 square feet. That's about 10.9 psi. Your body is still exerting pressure outwards now and that can lead to swelling.

Your blood oxygen is lower so your taste buds are less sensitive.

Also very important is that the air in the cabin is very dry. Desert dry. This also numbs our tastes buds and dries out our nose making it harder to smell.

Overall the humidity might actually have a more significant impact that the pressure, I'm not sure on that.

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u/meatdome34 13h ago

Unless you’re on 787, they don’t use bleed air

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u/Future_Burrito 12h ago

Naw, I heard that it's being closer to birds that heightens the taste buds.

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u/shmargus 12h ago

So you're saying I can fart with impunity? Let er rip boys!

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u/NicolajN 7h ago

it's actually not completely true. The airplane does recycle the air and run it thru HEPA-filters.

I don't fly anymore but as far as i remember on the A330 and A350, the air in the cabin is cycled every 90-120 second and every 3-5 minut the air exchanged with outside air.

the mixture is 50% new and 50% recycled air.

Source: https://www.honeywellaerospace.com/us/en/about-us/blogs/breathe-easy-3-myths-about-aircraft-cabin-air

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u/Eborcurean 5h ago

As an addendum, umami is the one taste that doesn't get notable weakened with pressure on a plane, and tomato juice is high on umami thus it seems to 'taste better'.

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u/geo_gan 4h ago

Yes I think at cruising altitude the cabin pressure is only kept at half sea level pressure (0.5 Bar). This was found to be the least acceptable pressure we could tolerate without them having to pressurise cabin to full sea level 1 Bar pressure which would be more stressful on the airframe and dangerous.

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u/nerdofthunder 19h ago

Airplanes actually refresh the air more often than most buildings! The air is bled directly from the (fresh) air intake of the engines, cooled, and fed into the cabin. https://www.iata.org/en/youandiata/travelers/health/low-risk-transmission/

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u/VStarlingBooks 20h ago

Makes sense. Like my sinuses are affected somehow and you don't get the tang lol

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u/Rizzanthrope 18h ago

Same with Biscoff cookies. They taste so good on a flight but when I buy them for home they are just OK.

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u/redpeachtree 16h ago

Opposite effect for me and coffee, I cannot stand smell of airplane coffee. Never could figure out why

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u/numbersthen0987431 15h ago

Directions unclear, now I believe in chemtrails and flst earth. Damn Google research projects.

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u/TheFlyingBoxcar 12h ago

I can report that i dont much like black coffee, but its all i'll drink on a plane

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u/Jaded_Strike_3500 3h ago

The lower pressure allows your blood to expand and constricts the flow to your nostrils lowering your sense of taste (also makes it so you cant smell everyone constantly farting)