Mezametara Saikyou Soubi to Uchuusenmochi Datta node, Ikkodate Mezashite Youhei toshite Jiyuu ni Ikitai - Vol. 1 Ch. 3.1

[icekatze]

@Argolok
The habitat ring is close enough to real gravity for most purposes. Also, onboard the Krishna, we see Hiro walking around without using a centrifuge. There are some slight differences in the drop-off of force between gravity and centrifuge, but a spinning habitat would definitely work for separating heavier and lighter substances in a suspension, including soda. (Separating materials is actually one of the most important uses of industrial centrifuges.)

 

[icekatze]

@Aichan
If you are in a spinning habitat, are holding a can of soda, and let it go; the can will not stay suspended in air.

Objects in motion stay in motion. As you are holding the can, it is in motion. Even after you let go, it will continue in the trajectory it had been going in. That trajectory will end with it hitting the 'ground'. In order for the can to not hit the ground, you would need to throw it away from you in the opposite direction of the ring's spin, and with enough force to cancel it's previous vector. (This is, of course, not counting air resistance from the moving mass of air inside a pressurized cylinder.)

 

[Aichan]

@icekatze
Yes, you're right in that it is in motion. Yes, it will eventually hit the ground if the inertia is strong enough to counter the air resistance. If you throw a can in space, it will go that one way almost forever unless another force acts upon it. If the spinning of the ring is fast enough to create inertia for the can that can counter the air resistance, it will hit the ground eventually.

However, it is different from how actual gravity works. It will not fall to the floor directly below but hit the floor like tens of meters away with enough energy to smash open the can (considering that at a radius of 2 kilometer, you'd be moving at 140 meters/second if you want to achieve 1G). If it is too weak to break, its inertia will be canceled out and will now become suspended in the air (if it doesn't bounce) and therefore appear as if there is no force acting on it. And under centrifugal force, gas and liquid does not work in the same way as they would under real gravity. As such, under such micro force, the gas will remain between the liquid, and not try to break out to the 'top' as with real gravity.

Therefore, if you drink it, it will feel the same as if you would drink it in a weightless state. You will not burp, and when you do burp, it will be the same as vomiting acid. Can you drink it? Yes, you can, if you're feeling awfully masochistic, but it won't be a pleasant experience.

 

[icekatze]

@Aichan
Your reply is a little confusing, but I'll try to go over all the important points.

Air resistance makes it easier for the object to hit the floor when dropped, not harder. The object will drop in a curved trajectory from the perspective of an observer on the ground, but in a straight line from the perspective of someone outside the cylinder's spin. For a cylinder rotating fast enough to produce roughly 9.8 m/s² at the ground, the difference in energy between the ground and the falling can isn't going to be enough to smash it any more than dropping it on Earth.

Judging from the windows on the buildings and the curve of the walls, the cylinder has a radius of about 125 stories, which using modern standards is about 537.5 meters. To simulate 1g, the rotation rate would be roughly 1.29 rotations per minute. Rotation = sqrt ( 9.8 m/s² / ( 0.011 • radius)) Plug that into the circumference of the cylinder and you get a tangential velocity of 72.6 m/s at the ground.

A body at the ground is moving at 72.6 m/s at a vector perpendicular to the radius. However, the ground is maintaining a constant distance from the center creating an additional vector toward the center. So rather than flying off into space, there is an equal and opposite force applied by the ground to the body, as described by Newton's third law. That momentum is conserved through all of the material placed above the ground, including the liquids and gasses trapped in the stomach.

 

[JavelinJoe]

Carbonated drinks is somewhat new. Not sure if it is enough to decide a life around, since he did just give a very good reason why you dont have them in space. A potentially deadly reason at that. Plus, do you know how expensive that would be? Meat is considered a high class luxury. A few cans could likely be even more expensive. Given that they cant be taken into space, and now every can has a mortgage attached to it... Though MC is apparently set for the next 40 years or so.

But its still better than the standard "rice, soy sauce, miso, mayonnaise, and eating a raw egg are all very crucial necessities for living, being on the same level of importaince as water and shelter", "chopsticks superior to fork", "katana is the only viable weapon", "Japanese is an unknown/unspoken but inarguably superior language compared to all others" and other things which tend to plague isekais.

 

[Aichan]

@icekatze
I'm guessing you're confused with the 'throwing a can into space' thing? I meant if you are in space (not in a spinning habitat) with nothing around you but yourself. And my 2km radius remark was an estimation. I don't know the radius of the rotating section.

My point with my post was that centrifugal force is not the same as gravity that you get from standing on a planet or other high mass objects. The gas will not separate from the liquid like you'd see on Earth, so the soda will behave the same way as if it's under weightless state if drank.

 

[icekatze]

@Aichan
It is not gravity itself that separates the gas from liquid on Earth, but the forces applied on the fluids as they resist the pull. In Low Earth Orbit, the pull of gravity is still about 9 m/s², but it is not being resisted while in orbit. Again, this is related to Newton's third law.

If you are in a rotating space habitat, materials will still separate based on density. This is called Centrifugation. While standing on the rotating ring, the ground pressure force will be conserved through the fluid. If the fluid is dropped, the separation will temporarily stop, but that is the exact same thing that will happen if the fluid is dropped inside a gravity well. (See above about the gravitational pull in LEO.)

 

[Eldwin]

Even in space there's an equivalent to an adventurer's guild

 

[Aichan]

@icekatze

Would the centrifugation force that is meant to not be lethal for humans be enough to separate liquid and gas in a rotating ring, though? On Earth, we separate blood plasma through centrifuging, but that requires between 500g to 2000g, a force that is lethal for humans.

Thanks for your input.

To be clear, I'm not saying that it has to be 500g, I was just asking if centrifugation is capable of separating gas from liquid without causing adverse effect on human beings. The blood plasma thing is just an example.

 

[wankerLin]

Hmm feels incomplete, it's lacking a slave girl.
What's the point of owning a space ship if you got no maid or slave girl onboard.

 

[icekatze]

@Aichan
The forces required to separate different substances will depend on the properties of the substances, and how much time is spent. Blood plasma will separate in 1g, if you let it sit long enough. Centrifuges are used to speed up the process. If you're interested in some really nitty gritty details on separation of particles inside fluids, Stoke's Law is a good place to start.

Because there is a very high difference in density between the gas and the liquid in a soda, the separation happens much more quickly and easily than blood and plasma.

 

[Mojo]

I knew a gamer like him, drank so much Mountain Dew he gave himself kidney stones and he was barely in his 20's. Had to stop drinking it, had the same reaction. God is dead indeed.

 

[ak0ztik]

well, atleast the MC didn't crave for Rice or Soy Sauce, like the many other manga's i've read.

 

[tonie]

@wankerLin read closer, it says "part 1". There is yet hope chance possibility.

@Mojo and why the hell did you ... Nevermind I used to drink a lot of pepsi but lately I stopped. Now I don't even like the taste of it or rather, now I hate pepsi and cola. (Did I just get bored of it? No.

Spoiler

No I didn't drink it that much to get bored of it, when I broke with pepsi I still liked it, but then I suddenly realized it tastes bad and I just craved for the sugar contained within it like an addict, not the taste or bubbles.

)

Anyway. You are in space (space colony), in a futuristic world and you miss your original world because you lack cola... Not the family, friends, your favorite anime and manga but some cheap cola.. wake up duud, there's a freaking elf in front of you, go and flirt with her or something! It's a frickin' elf! Space elf!!

 

[cullinaire]

Well, to be fair Japan is a paradise when it comes to the variety of drinks to choose from. And I love those vending machines that don't rip you off (100yen even in the freaking airport!!!). So when MC went full orz, I was 😌
I do like the spelf though, hopefully the MC comes around for her later on.

😀

 

[Mojo]

@tonie Well the main character is a gamer isekai'ed into a spaceship game. And he is obsession over a carbonated beverage, which was enough memory association for me to remember another gamer I knew obsessed with the bubbly. Speaking of memory association..
Your "Space elf!" reminds me of this ^_^
https://www.youtube.com/watch?v=MwpmqMnngRk
Good luck watching Game of Thrones after watching Peter Dinklage sing that. 🤣

 

[Liquidxlax]

@Mojo For some reason I'd think I'd want a familiar drink and or food. Coke is pretty much the only pre prepped food that I'd want while the rest is mostly home cooked stuff.

@cullinaire I don't know how they can stay proffitable at 100 yen. I do understand a price increase on drinks, but yeah we are overinflated in Canada and the USA at least as I see 710ml bottles go for 2.75 to 4.00 bucks while most stores sell them separate for 1.50 and a 6 pack for 6 which is overpriced as we useed to get 2l for 1 buck

 

[oukamihalf]

Oishii Mart

 

[Iwizesol]

this is why i like Sci- fi,

All the space geeks come out and talk SCIENCE!

....awesome...

 

[Rheeve]

@Eldwin
Well, a central hub really helps with announcing tasks/missions/shit-people-dont-want-to-do-themselves and facilitates information exchange. Not to mention, an Adventurer and a Mercenary is essentially the same thing with different names.
Also, you could just offload all that on a computer network, but you would still need people to maintain the tech(or maintain the bots that maintains the tech, or maintain the bots that maintains the bots that maintains the tech etc.)