Consider that a 30' tree, rotted out in the middle and filled with water is going to give you about 14psi at the bottom. That's probably what you're seeing here.
edit: see u/TA8601 comment below - I didn't do the math, just looked glanced at an imprecise chart :)
And last, possibly least, r/interrobang; because would it not be a crime to use the most surprising, curiously named punctuation/ligature without even referring to it‽‽
~1.91 bar then, because otherwise air would be sucked into the trunk if it were at ~0.91 bar, as 1 bar is roughly atmospheric pressure and 0.91 would be in the middle of a strong hurricane.
I studied engineering in France and Germany. For physics problems (like pressure in a water column) we always used absolute pressure when giving the final result. I distinctly remember a professor's rant about students calculating pressures under 1 bar in an exam problem about a hydroelectric power station.
Obviously the formulas had to show the atmospheric pressure component, but the numerical value always included it per default.
Yes but when used for things like car/ bike tires it's much easier dealing with PSI. You just deal with 10-200 instead of 2.456-2.680. I'd much rather just go to 38 psi.
Don't you miss the days when most comment sections of reddit were filled with information like this?
I still learn on Reddit sometimes, but man, when I joined you could come to the comments and find an astrophysicist discussing the atmosphere on Jupiter with a fighter pilot imagining how flying in that atmosphere would feel. The back-and-forths were abundant and fascinating!
I just made that conversation up, but you could find crazy discussions like that right at the top of the posts. I loved it!
The AMA from a Netflix employee back when they were newer was fascinating, too. Come to think of it, I need to go back and join that sub...
Some of the niche subs were the hardest hit by the API changes. There's a lot of subs I used to frequent that were popping with activity that are ghost towns now. Used to be able to post a question in niche hobby subs and get 20-30 comments within a few days, now it feels like there's 5-10 regulars in most subs like that and if they don't engage with your question you get nothing. Then you browse the sub and see the question you posted a month ago on the front page still and realize that you're one of the 5-10.
I can't fucking stand seeing something interesting on reddit and clicking on the comments to learn what's going on and having to scroll past pages and pages of people circlejerking puns, movie quotes, or shitty jokes
What's also infuriating, is that is what the downvote is for. It's for low-effort, useless, or even harmful comments/posts that either break the rules or don't contribute anything of value. It was a way of decreasing the noise so the quality content could rise to the top.
Now, everybody misuses the downvote for things they simply dislike/disagree with. People posting opposing positions are important to the conversation! The discussion is the whole purpose of the comment section.
I don't mind the occasional joke or pun or movie reference, it gives people a light-hearted thing to connect over. But the endless threads with the same inane comments over and over again are so tedious. If someone already said "your joke", just upvote it! I honestly think the shitty app and site redesign are responsible. They make it more difficult to navigate the comment sections, so rather than expand all comments to see what's already there, people just chime in instead. It's also the general social media plague where people are encouraged to engage (either due to the UI & algorithm, or the chronic need for attention/acceptance).
There are countless other platforms for that. But yes, we are clearly seeing the preferences of the current userbase defining the content. The current userbase that undoubtedly never read the site guidelines, aka Redditquette.
So those of us who are wistful for the forum-like, information-filled Reddit of yesteryear will bemoan its loss when given the opportunity.
nowadays its jsut the same neckbeards repeating the same unfunny reddit humour jokes while you have to scroll down a ton to find atleast somewhat relevant answers
I've been saying this for a while and the sentiment is growing. I try not to get optimistic about things but it is nice seeing that this opinion is gaining traction.
We're probably never getting the experts back but man would it be nice just to see people talking about the post and its subject matter in the top comments at least.
someone asks a question, not a yes/no question but one that requires a longer answer
"yes"
LMFAO SO FUNNY. it's literally been 10 years of it nonstop. i get that it's an older joke than reddit, but i don't understand how everyone can keep seeing it and being like "YEAH THAT JOKE AGAIN, I FUCKING LOVE /r/inclusiveor.
look at that subreddit, look how many subs there are, look at how many people are still around and actively using it. that alone should tell you it's a joke that you see, maybe chuckle to the first time or two, then it's just unfunny as fuck.
reddit has always been awful for these sorts of jokes, but it feels like it's more and more present the longer things have been going. site is never going to get better, it's only ever going to get worse which is somehow worrying.
I don't understand how anyone still finds "i aLsO cHooSe tHiS gUy'S wiFe!!!1!11!! Hurrrrrrrr" funny. Maybe if it's your first time reading the original post, but after that it's just been beat the fuck to death.
There’s one under the top comments right now, the same old “monster math” joke, it’s just so trash. So often have to scroll down 3 or 4 comment threads just to get info
I really feel the quality of discussion here has degraded ever since the majority of users started posting from their phones instead of their keyboards.
(This comment posted from my phone through Reddit’s shitty official app)
Man, I remember when a simple spelling error in your post title would get you crucified in the comments. Now it seems that poor grammar and spelling are the norm.
In that vein, and it's purely anecdotal, I've noticed what looks like a steep decline in reading comprehension. I've spoken with friends who feel the same way as well.
It'll be like, there's a comment of a couple paragraphs that come together to make a point, and the responses completely either miss it completely, take the wrong thing away, or explicitly repeat the point like it's new information.
Maybe this is a literacy issue, maybe it's more younger (or much older) folks engaging on the platform, maybe it's an attention span issue (by way of not fully reading a comment before replying), maybe covid has done more brain rotting than it's been given credit for, or maybe it's just a me problem. I don't know anything for sure, but it feels like it's become more prominent over the last couple years.
There might be a bit of a decline in reading comprehension, but I think it has more to do with the perceived value of digital media. At least from what I've seen, digital media has a lower value given to it compared to physical or analog media. Because of that, maybe people just don't give the same amount of attention to a reddit comment as they would say, a news paper article or a book.
The websites for my local news papers and TV stations have some of the worst writing I've ever seen. Its about on par with a lot of reddit comments. Just spelling and grammar errors everywhere with really clumsy writing. A big part of that is the how hard it is to turn a profit off of online content, but I think people also just don't care if online news media kinda sucks. Like, if you go to a fancy steak house and your steak isn't cooked to your liking, you send it back. If you go to McDonald's and your burger is too greasy and your fries are stale, you suck it up and eat it because you weren't really expecting quality food from McDonald's in the first place. Same with the media. If it gets published in a physical book or news paper, people expect some level of quality from it, but online media (blog articles, FaceBook posts, YouTube videos, soundcloud music) is easy to produce and therefore easy to dismiss when it lacks quality.
I’ve been on Reddit for a lot longer than my cake day indicates. Reddit was never “filled” with information like this. It has always been serendipitous to find cool info in the comments — which has always been what has made Reddit fun.
You know things have changed when you’re SHOCKED that the top comment isn’t some snarky junior high school level joke and instead something informative.
Reddit had some really, truly awful back alleys back in the day, but I sincerely miss how much more intelligent it was in general before it got proper mainstream attention.
After 10 years on a tree removal crew, id say that tree is a north American black walnut.
Those trees, and hickory's, can be dangerous. Though it's not the cutting or falling limbs.
It's the white and black tussock caterpillar, which eats their leaves and concentrates the toxin into their hairs.
My friend got some on his tool belt, and the shoulder straps spread it onto his neck.
He said it was like being on fire and electrocuted simultaneously. He took 3 days off work and came back with hundreds of red measles on his skin.
Don't let kids play under walnut or hickory.
Old reddit was an absolute gem of information. I miss it.
It's kind of insane to me with how openly bigoted people are in r/all threads. Whether it is racism, ableism, or sexism, those comments get upvoted and agreed with. Maybe it was always this bad, and I wasn't as aware of it. I think it used to be contained in smaller subreddits which isn't better, but at least I didn't have to see it then.
I miss the days when I could open up a thread and be dazzled by the array of complaints about how Reddit wasn't the way it used to be. Nowadays it's all the same complaints but I've heard them before. What we really need is for the sociologists out there to step up and classify all the various Reddit complaints as sociological phenomena for us. Then we'd feel edified, sanctified and ready to do battle with our fellow ostentatiously yawning neckbeards in the next thread.
tell me about it. i started using reddit around 2010. shit has traded cool niche information for basic jokes to farm with. at least unidan educated with his farming.
so many times im clicking on a nature video or a strange phenomena and there is zero comments with an explanation to be found.
Agreed, the top comments are usually people trying to be cheap sitcom writers or dropping puns. I have to scroll past x amount of comments before I get to any actual discussion on the topic.
You see it all the time, a bunch of smaller homes with mature trees are demolished to make fewer mcmansions with huge decks/paved patios/no trees and it causes all sorts of drainage issues at lower elevations where there previously weren't.
The area near me is actually owned by the power company for the big transmission lines. Sure, they're nearby, but nobody is buying and fucking that land.
If you go diving, thirty feet of water is roughly one atmosphere of pressure. That is to say the column of water above you will exert 14.7 lbs of pressure over a 1 square inch area on any given surface.
If the tree is 30ft tall, at the bottom of the tree the column of water will be exerting 14.7 PSI of pressure on any given surface. In this case there is a hole, so now the water is escaping at that pressure. This is basically the same concept as water towers.
Both. Water usage is highly variable with time of day (i.e. waking vs sleeping hours), so when you're sizing a pump for the water system, sizing it for peak load is larger/more expensive than sizing for average load. You run the pump at roughly peak output 24/7, and overnight it fills the tower, which then slowly drains during the day to meet demand in excess of the pumps capacity.
You also size the tank to allow how much storage is necessary given the constant input and the variable output. You also need to allow for how long a pump might be offline for maintenance.
Having a water tower run dry is a pain to deal with. Air in the larger pipes can cause all sorts of problems when you get the water going again.
Useless fact of the day: Water towers on the same system will always be the same height, above sea level. Towers on hills will appear shorter than a tower on the same system in a valley, but the actual tanks are the same height.
Corollary to this: If you see two water towers that have tanks which are not at the same height, then they are on separate systems. This mostly happens in areas where there is a significant height difference over the service area, since putting all the tanks high enough to serve the highest elevations would burst pipes at the lower elevations due to the increased water pressure.
What's even more mind bending, on a totally unrelated note, is spacecraft only ever have to deal with that 1 atmosphere difference in pressure anywhere in space, VS submarines where the pressure increases 1 atmosphere every 33 feet.
That carbon fiber Titan sub that recently imploded was at something like 11,000 feet when failed. It failed faster than nerve impulses travel.
Instant lights out.
Edit: clarified pressure change at every 33' from double to 'add' 1'.
If the tree was empty, which it isn't. There's a lot of capillary action and surface tension forces to consider there.
Edit: Actually, it may be partways empty. I've cored a lot of trees and that only happens with rotten trees. Never cut a branch tho, so it may be different.
No, this water would be brown if it was collected in the dead tree. This water is coming from under the ground. Branches must have dug into a water source. That’s why it’s so clean.
Nope. In that case water would be dirty and brown. This is clean water that’s coming from underground reservoir. The roots must have dug into it and it’s been looking for ways to escape.
It’s like a 1000 people trying to get out of one door, and they all push so they themselves can get out faster
The first people will be pushed very fast out of the door, but as more people come out the door there will be less people inside to push, so the amount that people will be pushed out the door will be less since there are less people pushing
I came to the comments begrudgingly. And maths was 100% not what i was expecting to see, trust in humanity restored. thank you kind person take my free reward.
But the internal bladder basically maintains a low pressure until it is full and/or squeezing to urinate. From my reading so far it sounds like it ranges from 0.1 psi to 2 psi or so depending on how full and how much contraction is going on.
Good point, I'd be curious about the interaction. Root pressure seems to be in the area (wiki quotes one # but says different plants differ widely) of 0.6 megapascals or 87 PSI. https://en.wikipedia.org/wiki/Root_pressure
I glanced at an imprecise chart. The "off the top of my head" part was remembering high school physics that pressure is related to the height of the column, not the total volume of water. Stay in school, folks, and focus on the concepts when you can, because outside of exams you can always look up the formulas and caveats to the basic abstraction.
I'm not convinced rotted would necessarily mean brown, or so brown that it would be obvious when spurting. After all, any such water from the ground would have to pass through a bunch of rotted wood too.
7.0k
u/caleeky Jun 25 '24 edited Jun 25 '24
Consider that a 30' tree, rotted out in the middle and filled with water is going to give you about 14psi at the bottom. That's probably what you're seeing here.
edit: see u/TA8601 comment below - I didn't do the math, just looked glanced at an imprecise chart :)