• SillyDude@lemmy.zipEnglish
      0·
      19 days ago

      I hate “delta p” so much, as in the term. I’m convinced divers just used it so they could sound even more elitist and like astronauts when they’re just dudes with a few grand and nothing better to do. Erm, akshualy that isn’t a vacuum, that’s a device that’s creates delta p. P stands for pressure and delta is a scientific notation for change. Cool dude, now finish delta p-ing your fucking room.

      • Wolf314159@startrek.websiteEnglish
        0·
        18 days ago

        Ok, maybe just go back to watching Big Bang Theory and keep your anti-intellectual bullying out of the science memes community.

        • SillyDude@lemmy.zipEnglish
          0·
          18 days ago

          Lol, you work IT and have a main on a startrek instance. You’re so unironically the exact person you posted you hate. You’re fucking hilarious.

          • Wolf314159@startrek.websiteEnglish
            0·
            18 days ago

            Doubling down on the bullying with an incoherent rant that has no relation to the comment or actual truth is a weird strategy here. I don’t work in IT. I expressed no hate (that was you). I do have little tolerance for bullies. But, it’s not hate that I feel towards bullies, it’s more pity and disappointment than anything. Are you okay?

      • TranscendentalEmpire@lemmy.todayEnglish
        0·
        19 days ago

        I’m convinced divers just used it so they could sound even more elitist and like astronauts when they’re just dudes with a few grand and nothing better to do.

        Hey… Some of us just like blowing bubbles and hanging out with fish.

        It is pretty fun, but to be honest not worth the money if you have to pay for the training yourself, especially if you don’t live near a good diving spot.

        • mojofrododojo@lemmy.worldEnglish
          0·
          18 days ago

          It is pretty fun, but to be honest not worth the money if you have to pay for the training yourself, especially if you don’t live near a good diving spot.

          yeah, this is very true. I’d love diving tropical stuff every day but don’t want to live where it’s warm lol; where I live there are some crazy folks who drysuit dive all the time, but even then it’s waaaay too cold for me. I want the water warm but the rest nice and cool lol

          • Taldan@lemmy.worldEnglish
            0·
            18 days ago

            I’m one of those crazy drysuit divers. I’m usually plenty warm on a dive, and seeing a pristine shipwreck at the bottom of the great lakes is pretty awesome

      • Brosplosion@lemmy.zipEnglish
        0·
        18 days ago

        Static pressure on it’s own doesn’t really “do” anything though. You could have the thinest piece of solid material with 10 million atmospheres on either side and the material doesn’t care since forces cancel out. Difference in pressure is where shit goes pop or crush depending on the direction.

        • altphoto@lemmy.todayEnglish
          0·
          18 days ago

          This statement is incorrect. Pressure directly affects materials. Its just without pluging the hole with a part of your body you don’t actually feel the difference. In static 10 million atmospheres stuff like metal should show some measurable shrinkage. The larger the object, the more shrinkage you will measure.

          • Brosplosion@lemmy.zipEnglish
            0·
            17 days ago

            Yes, you are technically right. Little too much hyperbole on my part, but the bulk modulus of solids in typically in the tens to hundreds of gigapascals

        • Taldan@lemmy.worldEnglish
          0·
          18 days ago

          Divers frequently go to pressures of 500+ PSI without issues directly from the pressure

          Nearly all the issues at that depth are from the physiology of breathing gasses at that pressure

  • birdwing@lemmy.blahaj.zoneEnglish
    0·
    19 days ago

    i remember a greentext about this, and a wiki article, but where is it again? I thought it was the Norwegian oil platform disaster but no

    there was some talk about how they got discombobulated and their bodies had gross dismemberment or something, being entirely suctioned through

    edit: aha, found the article!

    Colourful NSFW description ahead

    Investigation by forensic pathologists determined that Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the crescent-shaped opening measuring 60 centimetres long created by the jammed interior trunk door. With the escaping air and pressure, gross dismemberment ensued; it included bisection of his thoracoabdominal cavity, which resulted in fragmentation of his body, followed by expulsion of all of the internal organs of his chest and abdomen, except the trachea and a section of small intestine. These were projected some distance from the bell, with one section being found 10 metres vertically above the exterior pressure door.

  • LibertyLizard@slrpnk.netEnglish
    0·
    19 days ago

    Is that enough pressure differential to injure you? Get stuck yes but 6.5 PSI doesn’t seem that crazy.

  • qevlarr@lemmy.worldEnglish
    0·
    18 days ago

    When it’s got ya… It’s got ya!

    Let’s watch that video again, it’s been a couple of years again

  • Rookeh@startrek.websiteEnglish
    0·
    18 days ago

    I’m not sure if this is triggering either thalassophobia or submechanophobia but either way thanks I hate it

    • 87Six@lemmy.zipEnglish
      0·
      18 days ago

      Bro is about to be sucked into the opening and mangled to death then drown because of the flow / pressure / whatever

      • prenatal_confusion@feddit.orgEnglish
        0·
        18 days ago

        It would not let them go once attached but sucking through? If the hole is 10cm in diameter i would think it wouldn’t rip them apart.

        But let’s physics this please!

        • glorkon@lemmy.worldEnglish
          0·
          17 days ago

          Let’s do it:

          The phenomenon that causes divers to be trapped is called differential pressure, or Delta P. It requires surprisingly little Delta P to trap divers in such a way that they can’t free themselves.

          The formula is simple: F=Δp⋅A

          Δp = Differential pressure, A = the area the differential pressure acts on, in our case the cross sectional area of the pipe.

          Example:

          30 cm pipe => A = π⋅(0,15)² m²

          Delta P only (!!!) 0.1 bar (= 10 kPa).

          F = 10,000 Pa ⋅ 0.07 m² ≈ 700 N. This equals roughly 71 kg of weight.

          Now, let’s try this with the numbers above. Unfortunately, we don’t know the diameter of the pipe so let’s again assume 30 cm:

          Δp = 21.375 - 14.7 psi = 6.675 psi ≈ 0.46 bar = 46 kPA

          F = 46,000 Pa ⋅ 0.07 m² ≈ 3250 N.

          => You would be sucked to this pipe opening with a force of roughly 330 kg. In other words, you’re fucked.

          For fun, let’s assume a 50 cm diameter pipe:

          F = 46,000 Pa ⋅ 0.196 m² ≈ 9020 N.

          This equals roughly 920 kg of weight.

          => There is absolutely no escape here and I think it’s safe to assume the diver would be sucked through that pipe.

          And finally, to answer your question (I’ll skip the math here), a 10 cm diameter pipe with the same Delta P would mean 37 kg of weight. I think it would be possible to escape in this scenario, but it’ll not be effortless.