Comment on Anon's in trouble
spiritsong@lemmy.world 1 week ago
Wouldn’t this human in theory become a crumpled sausage like what happened to the crab by the leaking underwater pipe?
Not at 15 feet. I don’t know enough to say how fast the water would be leaving that hole, but it’s maybe a couple hundred pounds of pressure. If he even got caught, it would be super uncomfortable, but he ain’t about to get ∆p’d
If you wanna see a real crab-in-a-pipe situation, look up that Byford Dolphin everyone’s talking about
Let’s convert to metric so we can tell.
15 ft is about 5 m.
Water pressure increases by 10,000 pa per meter (rhogh, rho=1000 kg/m^3, g~10m/s^2), so total pressure is 50 kpa, or 1/2 earth atmospheric pressure.
One side of that hole has ambient pressure of 1 atm. The other side has that plus water pressure totalling 1.5 atm.
A pressure is just an energy density. Multiply by the cross-sectional area of the interface to get the energy gradient across the interface. An energy gradient is a force. We don’t have a measure of the cross-sectional area of the hole, but if we expect a person to fit through let’s call it 1m^2.
50 kpa = 50 kJ/m^3, so total force felt across this opening is 50kN which is the equivalent weight of five metric tons.
I’d say this person is going to have a bad time with five metric tons pushing them towards that little hole.
Let’s convert to metric so we can tell.
15 ft is about 5 m.
Water pressure increases by 10,000 pa per meter (rhogh, rho=1000 kg/m^3, g~10m/s^2), so total pressure is 50 kpa, or 1/2 earth atmospheric pressure.
This is very interesting. I like unit conversions.
What I did was just take 21-14 psi, and then converted that to bar or atm. I got a number close to ½.
I was like, half an atm? Can’t be that bad? I can handle 1 full mf atm literally all mf day mf.
But I guess that’s different somehow? I just don’t understand how yet. If anyone would care to go into it with me… 🙏
Remember a vacuum does not have suction it’s the air that presses things under vacuum together. One atm is actually quite a lot but we can withstand that as it’s pressing at us from all sides including inside.
The atmosphere is big and heavy. Small pressure changes on order 1% means hurricane. 50% of an atmosphere pushing on something is a lot.
Note, this is all Earth’s atmosphere.
Titan’s atmosphere is energy-denser than ours at 1.5 atm. Titan is Saturn’s largest moon.
Venus has 96 atm. Absolutely crushing and hard to visit at all.
Mars varies from like 0.3-0.6% seasonally as significant portions of its CO2 atmosphere deposit onto the poles as dry ice glaciers in a runaway greenhouse style. CO2 snows out, temps drop, more snows. Keeps going till the sun comes back. Sunlight sublimates the ice back into the atmosphere in a similar runaway fashion. Like a deep breath in and out with the seasons. The weight of all that ice falling and leaving keeps that red lump beating every year. Don’t believe those who say Mars is dead. We don’t know yet. Don’t count out anything with a breath and a beat. What is life on a planetary scale, anyhow?
The gas giants have atmospheric pressures so high it kind of stops making sense to use these as comparisons, and instead we have to look to geology for analogues as deep within the earth we also approach these energy densities.
Yeah I read the entire Wikipedia entry on the Byford Dolphin and I almost threw up because how vivid the description is. I think this would be my third time saying this but that’s not a nice way to go (to die) at all.
You weren’t kidding. Real horror movie shit.
You aren’t kidding that they weren’t kidding. I genuinely felt a bit of a ping of nausea and had to mentally distance myself a bit from imagining it too vividly.
Reference: www.youtube.com/watch?v=_-INIu_VK08
TwoBeeSan@lemmy.world 1 week ago
There was a story of maintenence divers that it happened to. Horrifc.
Will see if can find story.
zeezee@slrpnk.net 1 week ago
Imagine forcing your workers into more than 12h shifts, running on 30 year old equipment, the government straight up refusing to upgrade said equipment, while making billions in profits - they don’t call it gross profit for no reason…
Canonical_Warlock@lemmy.dbzer0.com 1 week ago
Normally when people say this it is at least a bit of an exageration, but not in this case. That is some straight up nightmare fuel.
Heres a taster for those of you who don’t want to read the whole thing.
Dasus@lemmy.world 1 week ago
You know how often a picture is worth a thousand words?
I feel like those words are worth a thousand pictures. All of them NSFL.
Tidesphere@lemmy.world 1 week ago
Am I reading the right article? I read the entire wiki article linked above and, quite honestly, the part you’ve quoted here is the only piece that even approaches being gruesome, and is very medically sanitized. What are people referring to when they say that the descriptions made them want to vomit and all this stuff?
CouncilOfFriends@slrpnk.net 1 week ago
The wildest part to me is someone having the last name Coward. The only way that surname makes sense is if someone changed it from something like Kiddiddler.