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You'd be right if the cavity is only compressing other organs inside the body without changing the overall volume, but I don't know why you seem to insist on making that assumption.
I thought it would be clear from my original description, via the analogy with lungs, that the cavity would not squish the internal organs but rather expand the overall volume of the body.
This is further proof that for every statement made, no matter how whimsical, there exists at least one person online who will tell you that you're wrong.
-The Earth revolves around the sun.
-Ackchyually, they all revolve around the galactic center...
-Godzilla floats by increasing his volume.
-Ackchyualllllly, his volume doesn't increase because lungs are on the outside... (Wtf?!)
-Cotton candy is my favorite fair food.
-Ackkkkkkchyualllllllllly, my review of the last three years of your comment history proves your favorite fair food is not, in fact, cotton candy. I have gathered and will prove this with ten points. Point one: your childhood experience with Geoffrey the Giraffe suggests...
Whimsical or not, there was a scientific misconception used in the statement, that I myself used to have as well. My only goal was to help dispel the misconception. Usually, Lemmy is quite welcoming to correction of scientific inconsistencies in sci-fi discussions. Idk what happened in this particular thread, but it went off the rails. All my statement got misconstrued and downvoted, despite me engaging in the discussion in good faith and being factually correct. Several people showed up, making incorrect or irrelevant statements and got upvoted.
Like your "lungs are on the outside" comment. Maybe you can explain to me, why am I being antagonized and intentionally misunderstood? Obviously I didn't mean that lungs are on the outside, context matters. And I explained the context in another comment.
I made that assumption because lungs aren't really inside, they are pretty close to the surface, so they are easy to expand. If they were inside, they would have to push other organs away.
And regarding increasing the overall volume of the body, I addressed that in another comment. Basically, Godzilla would have to visibly swell by a lot, to have that much buoyancy.
It could be that the swelling is only in the underwater part, but then Godzilla would tip over with any slight movement, because the center of mass would be way above water.
"Lungs aren't really inside" is not an argument that I thought I'd be confronted with.
If you find that your lungs are not inside your body then I urge you to seek immediate medical attention.
At this point, you're just trying to ridicule me over my choice of words and not actually trying to interpret them in the context that you yourself set:
Why mention "inside their body" if you didn't mean "deep" inside? All organs are "inside" the body. Therefore, I interpreted your words meaning truly "internal" organs, that that don't manifest themselves on visual inspection, like heart or bladder. Lungs, while technically inside, are peripheral and visibly expand - a critical distinction in this context.
So you specify "inside" and then mock my adherence to that framing, instead of addressing the core biomechanical issues being discussed.
Ducks and other waterfowl have the majority of their weight above the waterline. So do boats.
Yes, but birds are very light in general. Most of their volume is feathers and they have a low bone density to boot. As the result, they have a very hard time diving, and have to either dive at high speed or paddle really hard to stay underwater.
And regarding boats, it depends. Do you mean completely empty passenger boats? Then yes, their density is very low by design, because they are mostly empty on the inside. When fully loaded, a commercial cargo vessel, is 80-90% under water.
You can't prove that Godzilla's bones aren't hollow ballast tanks that can be emptied and filled as needed.
I can't, and I wasn't going to. My argument was never about what Godzilla can or can't do, it was about physics. Specifically, that you can't move stuff around internally, without changing volume significantly, to change buoyancy.
Deballasting bone cavities is definitely an option. But to achieve the levels of buoyancy displayed by Godzilla, they'd need to be truly massive. Or he's using paddling in tandem to help itself stay above water, akin to what dolphins do to hold most of their body above water.
Also, you can't squeeze bones, so Godzilla needs an organ that would force discharge that ballast. Like sacks of highly compressed air, which are used to push out the water completely. This is similar to what submarines do.
Instead of bones, we could also just use your approach with organs. Emptying sacks of water and filling them with air. But either way, we need to discharge ballast, as I was saying originally. It's a limitation of law of physics, and not a limitation of Godzilla's abilities.
Source: I have a bachelor's degree in Maritime Transportation and Navigation. Which is basically a BSc on "how to buoyancy right".
Hahaha, no.
While I can't find a comparable article for cargo ships, cruise ships are 10% underwater. A fully loaded cargo ship can't be more than 30% as they tend to be stacked far higher than the ship's sides. Ocean waves would easily swamp a ship that was 80-90% underwater.
Don't know what to tell you, man. You sound very confident, but I literally have a bachelor’s degree in Maritime Transportation and Navigation, and have served on several cargo vessels, as well as a couple of passenger ferries. I might have exaggerated with 90%, I'll give you that, so take it down to 80%.
As I said, those are usually mostly above water, to prioritize comfort. But even those are at least 30% underwater, with very low center of gravity. You can't have a ship 90% above water; it would keel over. Except some heavyweight barges that have big surface area, I suppose.
In fact, that's about the least an empty cargo ship is underwater. Because when empty, cargo ships take ballast to prevent capsizing. Also the propeller is designed to be at least a few meters below water to be effective.
I think you're focused specifically on container vessels. Those still have way more massive holds than the containers you see on deck.
Depending on the season and projected weather conditions, ships are leaded to a different extents. They have load lines for winter and summer. In summer, for certain cargo ships, the freeboard can sometimes be measured in centiliters. I remember being able to kneel on deck and reach the water with my hand. In heavy seas, the waves are constantly on the deck and the ship can handle it fine; you just don't go there.
Ships often look deceptive about their draft, because you almost never see a ship truly empty. Even when not carrying load, they have a lot of ballast.