|
nmfree posted:"scubaed dive", it's like "Attorneys General" Thank you kindly
|
#
?
Jan 30, 2018 08:32
|
|
|
|
| # ? Jun 11, 2024 15:47 |
|
|
Do you think whales have to teach their young how not to get the bends?
|
|
#
?
Jan 30, 2018 08:56
|
|
|
Whales don't breathe pressurised air, so I don't think it'd be a problem?
|
|
#
?
Jan 30, 2018 08:59
|
|
|
Nah they've found whale bones with the telltale scarring.
|
|
#
?
Jan 30, 2018 09:06
|
|
|
I'm reporting all of you to Sea Patrol.
|
|
#
?
Jan 30, 2018 09:11
|
|
|
Icon Of Sin posted:I just want to note that people get away with this while freediving because you didn’t take on any additional air to your lungs; if this happened while scuba diving, you’re going to get one of the more terrible flavors of DCS. I wanted to make that distinction, because that question tends to come up often enough when people ask me about some of the differences between scuba and free diving. Yeah, the only air that gets increased pressure is in your mask where you exhale through the nose to compensate for the pressure and your inner ear where you equalize. Both these just flow freely out when you ascend, which feels weird and fun. (And why you shouldn't dive if you've got a cold) As mentioned, you can get "lung squeeze", not only at great depths but also if you pack your lungs by trying to get as much air in as possible before the dive. I didn't go deep, maybe 20 ft or so. Haven't done it since, but will at some point, it's a great activity with less hassle than scuba and easy access to a wide range of tasty foods in the upper 60 feet of the sea. But I guess that belongs in a different thread.
|
|
#
?
Jan 30, 2018 11:21
|
|
|
nmfree posted:"scubaed dive", it's like "Attorneys General" Off topic, but I can't even tell if you're kidding. English is such a bastard language with conflicting grammar rules that it's fun to just think up plausible conjugations ("I have scuba diven, you haven't scuba divved, she scuba dove" etc), and an acronym-turned-adjective like "scuba" fucks it up even more. Google is very little help, and seems to suggest "gone scuba diving", "scuba dived", or "scuba dove" depending on whether or not you're an American, and if so, whether or not you live in the midwest. ObChemistry: Silane is a chemical I'd have assumed was pretty inert, but is apparently quite poisonous and explosive. The wiki page says it can form silicic acid in your eyes, but the page for sicilic acid uses the words "theoretical" and "hypothetical" so often I can't even tell if such a thing exists.
|
|
#
?
Jan 30, 2018 16:12
|
|
|
Syd Midnight posted:Off topic, but I can't even tell if you're kidding. English is such a bastard language with conflicting grammar rules that it's fun to just think up plausible conjugations ("I have scuba diven, you haven't scuba divved, she scuba dove" etc), and an acronym-turned-adjective like "scuba" fucks it up even more. Google is very little help, and seems to suggest "gone scuba diving", "scuba dived", or "scuba dove" depending on whether or not you're an American, and if so, whether or not you live in the midwest. Everyone I work with just says "went scuba diving" or just "went for a dive" or whatever.
|
|
#
?
Jan 30, 2018 16:32
|
|
|
Yo just been out to get my dive on, really dived it 1000%, totally dive.
|
|
#
?
Jan 30, 2018 16:43
|
|
|
Scuba duba did.
|
|
#
?
Jan 30, 2018 17:13
|
|
|
I learned about something called fulminating gold, apparently one of the first-ever high explosives discovered (in the 16th century) and renowned for being "expensive and explosive." Pretty much every alchemist and chemist until the 1900s has been injured by an exploding chunk of the stuff and it took until the end of the 20th century before anyone even figured out what the formula even is. How did I find this out? There's a publicly-traded company that wants to process a ton of the stuff a day to strip gold from PCBs in a small Tennessee town. Given recent history it seems like such a plant would be better situated in Texas...
|
|
#
?
Jan 30, 2018 17:42
|
|
|
Scuba chat is cool. I didn't know half of the things that could go horribly wrong there.
|
|
#
?
Jan 30, 2018 17:55
|
|
|
Kinetica posted:Scuba chat is cool. I didn't know half of the things that could go horribly wrong there. Well then have I got a read for you: https://en.wikipedia.org/wiki/Byford_Dolphin
|
|
#
?
Jan 30, 2018 18:09
|
|
|
Trig Discipline posted:Well then have I got a read for you: Explosive decompression like in the movies isn’t real. Except that one time...
|
|
#
?
Jan 30, 2018 18:17
|
|
|
Trig Discipline posted:Well then have I got a read for you: When your pressure gradient looks like a cliff, you're gonna need a spatula and a 50 gal bag to recover the bodies.
|
|
#
?
Jan 30, 2018 18:18
|
|
|
Kinetica posted:Scuba chat is cool. I didn't know half of the things that could go horribly wrong there. The doc I did the study with a few years back is an anesthesiologist by trade, but got pulled into diving medicine because he started exploring the narcotic effects of various gases at various partial pressures. Things that would kill you at the surface (air with > 15% O2, for example) interact with chemistry in such a way that it's safer to breathe that than the air we breathe now. We had to do some fairly in-depth (  ) diving physiology as part of my divemaster program, but I'm not convinced many of them retain an understanding of that unless they go on to become instructors. I see diving as sitting in this weird intersection of pressure physics, chemistry, biology, and physiology that no single field entirely covers. It's still a really niche activity whose outer bounds haven't really been well explored yet. Jacque Cousteau's grandson (Fabien) was part of a study a few years ago to see if any long-term effects manifested from living under pressure for extended times (among a whole pile of other objectives), so he stayed at FIU's Aquarius lab (formerly NASA"s NEEMO lab, in the Florida Keys) for 31 days. https://en.wikipedia.org/wiki/Mission_31 quote:Q:Most people will never get the chance to live underwater. Sounds like the stuff of science-fiction. quote:Q: Were you ever scared?
|
|
#
?
Jan 30, 2018 18:22
|
|
|
The Mythbusters actually did a decompression experiment and it is loving horrifying. https://www.youtube.com/watch?v=pRC5R1jRO58
|
|
#
?
Jan 30, 2018 18:40
|
|
|
Trig Discipline posted:The Mythbusters actually did a decompression experiment and it is loving horrifying. 
|
|
#
?
Jan 30, 2018 18:56
|
|
|
LostCosmonaut posted:Explosive decompression like in the movies isn’t real. vacuum is only 1atm away from normal also much less corrosive than water space: probably safer than being 100m underwater
|
|
#
?
Jan 30, 2018 20:32
|
|
|
Icon Of Sin posted:The doc I did the study with a few years back is an anesthesiologist by trade, but got pulled into diving medicine because he started exploring the narcotic effects of various gases at various partial pressures. Things that would kill you at the surface (air with > 15% O2, for example) interact with chemistry in such a way that it's safer to breathe that than the air we breathe now. We had to do some fairly in-depth ( Wait, why does your hair grow faster?
|
|
#
?
Jan 30, 2018 20:34
|
|
|
UberJew posted:vacuum is only 1atm away from normal https://www.youtube.com/watch?v=O4RLOo6bchU
|
|
#
?
Jan 30, 2018 20:35
|
|
|
5000ft= ~151 atmospheres worth of pressure. I love that the writers kept up with the little details like that ☺️
|
|
#
?
Jan 30, 2018 22:08
|
|
|
Phy posted:Wait, why does your hair grow faster? It's being squeezed out obviously.
|
|
#
?
Jan 30, 2018 22:08
|
|
|
Icon Of Sin posted:5000ft= ~151 atmospheres worth of pressure. I love that the writers kept up with the little details like that ☺️ If you listen to the commentary tracks on Futurama DVDs they talk a lot about how a bunch of the writing staff are actually math and science Ph.D.s
|
|
#
?
Jan 30, 2018 22:29
|
|
|
Syd Midnight posted:Off topic, but I can't even tell if you're kidding. English is such a bastard language with conflicting grammar rules that it's fun to just think up plausible conjugations ("I have scuba diven, you haven't scuba divved, she scuba dove" etc), and an acronym-turned-adjective like "scuba" fucks it up even more. Google is very little help, and seems to suggest "gone scuba diving", "scuba dived", or "scuba dove" depending on whether or not you're an American, and if so, whether or not you live in the midwest. Scooby-Doo'd?
|
|
#
?
Jan 30, 2018 22:33
|
|
|
Trig Discipline posted:If you listen to the commentary tracks on Futurama DVDs they talk a lot about how a bunch of the writing staff are actually math and science Ph.D.s Including Ken Keeler, who came up with a new theorem just for one episode.
|
|
#
?
Jan 30, 2018 22:36
|
|
|
The History Channel had one of those terrible "Doomsday: How the World Will End" serials where one of the examples they gave of the last humans who'd still be alive would be those in submarines. I think in the rogue planet and rogue black hole episodes, the sub got sucked into space and the crew were still alive simply because the sub was still suspended in water being siphoned from the surface and for the same point being made - that if a pressure vessel can survive multiple hundreds of atmospheres (the Seawolf's actual test depth is classified but that HY-100 steel is some nifty poo poo), it can survive zero...so long as the oxygen holds out. They didn't fare well during the GRB episode, though. 
|
|
#
?
Jan 31, 2018 00:37
|
|
|
BIG HEADLINE posted:The History Channel had one of those terrible "Doomsday: How the World Will End" serials where one of the examples they gave of the last humans who'd still be alive would be those in submarines. It's speculated a GRB was a cause of a mass extinction event at one point! 
|
|
#
?
Jan 31, 2018 00:45
|
|
|
Decoy Badger posted:I learned about something called fulminating gold, apparently one of the first-ever high explosives discovered (in the 16th century) and renowned for being "expensive and explosive." Pretty much every alchemist and chemist until the 1900s has been injured by an exploding chunk of the stuff and it took until the end of the 20th century before anyone even figured out what the formula even is. gently caress me running, it even blew up part of its wikipedia page
|
|
#
?
Jan 31, 2018 00:48
|
|
|
Syd Midnight posted:ObChemistry: Silane is a chemical I'd have assumed was pretty inert, but is apparently quite poisonous and explosive. The wiki page says it can form silicic acid in your eyes, but the page for sicilic acid uses the words "theoretical" and "hypothetical" so often I can't even tell if such a thing exists. Silicic acid is a hydrothermal fluid that has been inferred to have been given off by rapidly-rising granitic plutons as they exsolve fluids due to pressure loss. There are reaction fringes around the Heemskirk Granite in Tasmania where some of the limestone it intruded into has been dissolved and then replaced by quartz, theorised to have crystallised out of silicic acid. As far as theories go it fits all the available data, but it happened ~360 million years ago. It's very hard to piece together things from that far ago with a lot of certainty. Which brings me to my next quote: iospace posted:It's speculated a GRB was a cause of a mass extinction event at one point! While the end-Ordovician EE patterns of dying can be considered to match those theorised as would happen from a proximal GRB, there isn't any actual evidence. Speculation is the right word. Really, the K-Pg event is the only one we have hard evidence for, and that was only 65 million years ago and left actual positive physical traces. Anything further than that and you're staring down the barrel of at least one supercontinent cycle and the recycling of 90%+ of all of the continental crust on the planet. Hard to pin things down.
|
|
#
?
Jan 31, 2018 01:04
|
|
|
Memento posted:Anything further than that and you're staring down the barrel of at least one supercontinent cycle and the recycling of 90%+ of all of the continental crust on the planet. Hard to pin things down. Surely you mean oceanic crust ...
|
|
#
?
Jan 31, 2018 01:14
|
|
|
Duodecimal posted:Surely you mean oceanic crust ... Yeah I do, sorry. recycling oceanic crust, sediment-loading and burying continental crust.
|
|
#
?
Jan 31, 2018 03:51
|
|
|
LostCosmonaut posted:Explosive decompression like in the movies isn’t real. In space, you're only going from 1atm to 0. Human bodies don't like it but can withstand it well enough that lack of oxygen is a bigger problem (followed by being roasted by the god drat sun if you're not in shadow). 9 atmospheres to 1 is a much bigger change.
|
|
#
?
Jan 31, 2018 10:42
|
|
|
LostCosmonaut posted:Explosive decompression like in the movies isn’t real. Those who didn't see the post / username combo get airlocked.
|
|
#
?
Jan 31, 2018 10:45
|
|
|
To me, the most grimly fascinating part of the Bryford Dolphin incident wasn't the dude who got salsafied, but the other poor bastards who were just chilling out in their bunks reading. Going straight from 9 atm to 1 atm caused the lipids in their body to congeal, basically turning their blood into gelatin in a matter of milliseconds. They didn't even have time to sit up or go "wtf", just died laying there still holding their books, and were already in rigor before the first guy had finished dripping off the ceiling. There's dying, and then there's dying in some horrifying new way that nobody has ever died before. Trig Discipline posted:The Mythbusters actually did a decompression experiment and it is loving horrifying. omfg the sound it makes. That horrible crunching popping noise. If I saw that happen to a person IRL I'd probably have to eat a gun barrel.
|
|
#
?
Jan 31, 2018 12:05
|
|
|
Trig Discipline posted:The Mythbusters actually did a decompression experiment and it is loving horrifying. While that's ghastly and totally accurate, the nature of that diving apparatus is misleading about the dangers of that 'decompression'. Having the breathing pipe sturdily attached to 1atm results in the really unusual scenario of the entire weight of the sea trying to push him back up that pipe until his mush-liquid is level with the top of the sea. With almost any other setup - say, hypothetically, a pressure-equal suit with its own source of canned air - having a small crack will result in a very slow dribble of water coming in. Which is bad no doubt, just not violent. Anways huge derail, back to talking about OH-NO.
|
|
#
?
Jan 31, 2018 12:17
|
|
|
This BBC doco on saturation divers is interesting. https://www.youtube.com/watch?v=B3BWSMrgi3I At 21:20 they go over the lifeboat drill, but you'll really want to have watched all of it up to that point so you know what the hell is going on and why they all sound so weird. Anyway, these divers are living in a pressurised tube for a month and breathing heliox, so the boat they are on needs a special hyperbaric lifeboat that they can get to via an airlock. "It's basically a metal coffin", say the divers.
|
|
#
?
Jan 31, 2018 13:24
|
|
|
Gromit posted:This BBC doco on saturation divers is interesting. Ftfy. How do you go about rescuing people from a hyperbaric lifeboat like that? I assume they'd have to move to another hyperbaric chamber to decompress slowly, but getting them from a lifeboat in the middle of the ocean to another pressure chamber seems awfully difficult.
|
|
#
?
Jan 31, 2018 13:33
|
|
|
Serephina posted:While that's ghastly and totally accurate, the nature of that diving apparatus is misleading about the dangers of that 'decompression'. Having the breathing pipe sturdily attached to 1atm results in the really unusual scenario of the entire weight of the sea trying to push him back up that pipe until his mush-liquid is level with the top of the sea. With almost any other setup - say, hypothetically, a pressure-equal suit with its own source of canned air - having a small crack will result in a very slow dribble of water coming in. Which is bad no doubt, just not violent. The point of that segment wasn't at all to say that this is a common occurrence or hazard of most diving. It's Mythbusters. There was a story about a guy who was doing surface-supplied hard hat diving just like that when something went wrong, and as the story goes he was basically liquified and sucked up into his own helmet as a result. They were trying to demonstrate whether or not that was even possible, and it is.
|
|
#
?
Jan 31, 2018 14:07
|
|
|
|
| # ? Jun 11, 2024 15:47 |
|
|
So which is worse? Being crushed to death in a metal tube or having your brain slowly Alzheimer itself months after spilling a couple of drops of dimethylmercury on your glove? https://www.youtube.com/watch?v=NJ7M01jV058 The
|
|
#
?
Jan 31, 2018 21:29
|
|
