Dr. Stone Episode 12 Discussion

Lelouch0202 said:


I don't think holding their breath would work, you would definitely end up inhaling a little bit of air but yeah I actually wondered about the second thing too. If they could've just created some kind of pump which probably would've worked fine. Maybe they just didn't have the means to do it or create a long enough pipe for that matter.

Audinga23 said:
its just your opinion do you even know that 50 kg weigh droping down from one meter when he reach ground wiegts 10 times more? so 50 kg weig at the time of impact it hits ground with 500kg force ? so you want say that gumans posible to catch such wieight with sticks ...ok dude you won just go watch anime more :) evry meter of droping velocity weight increases 10 times .. so yeah do the match or go back to school.

Audinga23 said:
its just your opinion do you even know that 50 kg weigh droping down from one meter when he reach ground wiegts 10 times more? so 50 kg weig at the time of impact it hits ground with 500kg force ? so you want say that gumans posible to catch such wieight with sticks ...ok dude you won just go watch anime more :) evry meter of droping velocity weight increases 10 times .. so yeah do the match or go back to school.

aLotQuestion_ said:
To be honest, I don't understand how this work.
From what I saw, they just don't need to breath during the process.
They could have just:
1. Hold their breath, there are primitive people, someone should have better stamina to hold their breath and find this someone to help.
2. Make a long (glass)pipe and pump the acid out from a safe distance.
Why no one has thought about that? Am I fundamentally wrong about logic?

Knockator said:
It appears there are a lot of people who have misunderstood some of the finer aspects of the chemistry in this episode, so as someone who has actually studied chemistry for 5 years and stood in the lab working with all of these chemicals, let me clear up some of the misunderstandings.

1. Sulphuric acid
The chemical they're trying to get is dissolved in the lake's water - sulphuric acid (H2SO4). It's a liquid, and even in its concentrated form, you would have no problem holding your face just centimeters above the surface and taking deep breaths - because sulphuric acid is not very volatile, the concentration of the acid in the vapor is negligible (at room temperature and normal pressure). There is also fuming sulphuric acid (also referred to as oleum), which is sulfur trioxide dissolved in H2SO4 - but that's not the same thing, although it would admittedly fit closer to what was depicted in the episode.
If you touch concentrated sulphuric acid, it will burn your skin and, if not washed off with copious amounts of water, will cause serious damage within 10 seconds. Nothing fatal, though, and a small splash actually eating through the pipe on Senkuu's gas mask within seconds is complete bullshit. I've had drops of concentrated sulphuric acid on my clothing and often you don't even notice until you wash them, because that's when the weak fibers actually break and holes show up.
Through all this, I've only talked about concentrated sulphuric acid, which is 95%. You would never actually encounter this in nature, though. The concentrations in actual acid lakes are much more dilute, and thus the effects of exposure will be significantly weaker, to the point where you can touch the water and be completely fine if you casually go to wash your hands afterwards.

2. Sulfur
Sulfur is just the pure Element S. It's a yellow solid and not really dangerous in any way. You can touch it, lick it, even swallow it and be completely fine. If you eat a crystal of sulfur, it'll just come out the other end the same way it came in - because it doesn't react with anything in your stomach or intestine. It was not relevant in this episode at all, and was neither mentioned nor depicted.

2. The actual gases in this episode
There are 2 gases that are dangerous and common enough to be relvant here, one of which is mentioned in the episode. That one is Hydrogen sulfide (H2S), a highly toxic gas. The depiction of the silver turning black is a reference to the reaction of H2S with silver, which forms black Silver sulfide. There are 2 major flaws within the presentation in the episode. The first is the reaction of the characters. H2S smells. Really really bad. The stink is very bad even at concentrations so low they wouldn't even be close to being considered dangerous. If you've ever smelled rotten eggs, a burp on an upset stomach or a smelly fart - that's miniscule concentrations of H2S (among some other compounds). There is literally no way they could have approached an area with lethal levels of H2S without noticing the odor. The second flaw is again concentration. The depiction with the black spear makes it seem like one inch the air is completely fine while the next it's lethal - that's simply impossible due to diffusion and convection. What they would really have observed is the whole spear tip gradually turning blacker over time. It is possible for the gas to accumulate because of its density, though, which was correctly referenced in the episode.
I personally cannot confirm it because I've never gone that far, but we were told that when the H2S concentrations approach lethal levels, you actually stop smelling it. We were under strict instructions to evacuate immediately if we were to stop smelling when working with H2S.

The second gas that could be relevant here sulfur dioxide (SO2). I won't go too far into detail with this, but I will say that the reaction of the characters is again incoherent. Unlike H2S, SO2 won't kill you immediately if you breathe in too much of it, but it is highly irritating and will send you into a coughing fit. If someone were to approach an area with lethal levels of SO2, they would be coughing their lungs out way before they actually got there. It is quite similar in behaviour and toxicity to NOx, in that it will dissolve in water to form an acid, in this case H2SO3 (notably NOT sulphuric acid).

No, the episode is not realistic, but it is also not entirely false (gas accumulating in holes or craters is a very real danger - that's where the saying "canary in the coal mine" has its origin, as they were allegedly used as a "gas sensor" by miners). I think it's a Shounen anime and therefore a bit of negligience and some dramatic overstatement is completely acceptable, small inaccuracies like that are in pretty much every episode of the show. However, it is blatantly obvious that the writers of the manga have never actually encountered these gases in real life. Or if they did, they haven't taken a breath.

The most bullshit thing in this episode by far was Ginro being able to hold onto that Spear with Chrome at the tip. That's some grade A gravity defiance right there.

Benphyre said:
We didn't have much focus on Kohaku again this week but we get to see a bit of her backstory and see her in tears. Kohaku's tree branch scenes were awesome and I guess it is pretty obvious which is my favorite.

Anyway the collage for this week


And the full collage

Benphyre said:
We didn't have much focus on Kohaku again this week but we get to see a bit of her backstory and see her in tears. Kohaku's tree branch scenes were awesome and I guess it is pretty obvious which is my favorite.

Anyway the collage for this week


And the full collage

Vooo said:
They are making penacillin, why does Senku need all these extra ingredients? alterior motives? Is he the real villain?

MariusMan said:
So slow pace, but i love it anyway

ttcchen said:

and how long is that going to take to make? A long ass glass tube thats like what 20 meters long? Making a gas mask is way faster AND easier. It's also rather simple and logical too. Breath=die. so solution? Don't breath=don't die. Even a grade schooler can understand it.

ttcchen said:
1. anime's known for exaggerating things 2. wood is stronger than you think 3. yes humans are capable of this feat. stop underestimating us humans, you alien. 4. fix ur typos

Fluggyboi said:


Audinga23 is right, this feat of strengh would be absolutely impossible in a scientifically accurate context. Which was all this argument was. So you lost this argument. Now you're trying to pull the "its anime so its not realistic"- card, which is besides the point. You're even resorting to some kind of weird "you don't believe in humanity"- bullshit aswell as namecalling.
Pathetic.

ttcchen said:
1. anime's known for exaggerating things 2. wood is stronger than you think 3. yes humans are capable of this feat. stop underestimating us humans, you alien. 4. fix ur typos

WaleedAbbasVd said:


1. That's precisely his point.

2. A wooden spear definitely isn't strong enough to support falling mass. The other dude is rightfully pointing out the basic math involved. That stick should've snapped like a twig.

3. No human would be able to do it considering the mass involved and the former's need for balance. The heaviest weight lifted in recorded Olympic history is 470KG. The amount required to lift Chrome here would be higher and far more difficult considering he doesn't have a strong and stable base.

For all the talk about lifting weights, it's fairly evident that you haven't ever hit the gym yourself.

4. Do us a favour and take an elementary science course.

ttcchen said:

1. It's anime, what do u expect? Go watch a documentary if u want realisticness
2. Wood is strong. Stronger than u think. You would know if you've lived in the wild for just once
3. Do u know the average weight of japanese teenage boys? Way less than the average american teen. It's completely possible to reenact this scene irl. And yes i do hit the gym daily, especially since my job requires me to be physically fit. Why don't you leave ur keyboard for once and hit a gym, hm?
4. Do me a favor and don't talk to me without a brain in your skull.

WaleedAbbasVd said:


1. The series should stay true to its lore. Anyways, this is beside the point since you're incapable of grasping the point here.

2. Please do enlighten us with the type of "wood" that could support him. Hardwood such as oak doesn't stand a chance. Do share your knowledge, Mr Wild? 😂

3. Do you understand the conversation at hand? His weight is irrelevant due to the distance and momentum involved. He could weigh 30KG and the statement would still hold true.

Also, please stop lying to us. 😂

4. HAHAHAHAHAHA. The irony.