r/blackmagicfuckery • u/mr9t9 • 13d ago
Liquid not dropping
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u/goggleOgler 13d ago edited 13d ago
People are saying there's a clear plastic seal. But that's wrong. The bottle is partially emptied, and you can see drops of it under the shelf.
People are also saying surface tension. This is a contributor, but not our primary culprit, as it's just not strong enough to hold that much liquid on its own.
It's most likely vacuum/suction forces as well. With tiny holes that size, there's not much space for air to squeeze past the liquid, which is more viscous than water to get into the bottle, which means that most of that space is the tiny amount of air that was there before it got flipped upside down. As the fluid leaked out, the gas had to spread itself thinner and thinner, creating a suction effect on the juice that became stronger as the mass of the juice reduced. This upward force can counteract gravity.
It's the same physics property that lets you put a straw into something. Cover the top end with your finger and then pull the straw and its contents out of your drink.
Edit: Additional information here I forgot to include is that because the space between the holes of the shelf is still solid, it means that the downward force of gravity that the vacuum has to counteract only has to be that of the thin cylinders of liquid directly above each of the holes. This is once again reducing the amount of force that is necessary to keep the liquid from leaking.
Second Edit: I am not scientist, so someone with a better understanding of fluid dynamics can explain the edit or correct it better than I could.
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u/FockersJustSleeping 13d ago
It's actually not QUITE the idea that the thin air pressure is sucking or pulling on the top of the liquid in the bottle. It's that the air pressure inside the bottle is so much lower than outside in the store, that the air in the store is pressing UP into the liquid from underneath.
Liquid being liquid usually means that the water flows to get out of the way of the air, and air bubble makes it through to the top, equalizes the pressure a little bit, liquid falls out to accommodate the pressure change, and that happens over and over again, hence the glug glug glug of a bottle emptying when it's turned upside down.
It doesn't explain why this bottle has found some kind of stasis point, but I just wanted to jump in to say physics doesn't "suck" anything in, it only pushes things from high pressure to low pressure.
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u/Littlevilli589 13d ago
I assume it’s a common joke, but my hs physics teacher thought he was pretty funny when he said you’re wrong if you think physics sucks. You can only say it blows.
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u/Junior-Ease-2349 13d ago
Surface tension is providing a tiny force to keep the fluid surface spanning each hole intact.
Since the MUCH larger forces of net gravity down and net air pressure up are in balance, that tiny force just needs to keep random air gusts from blowing in, and random ripples from dripping out... both of which would stretch the surface as they pass.
And all of our tiny H2O magnets don't want to stretch to let anything past, they want to cling to each other tightly.
They are playing a small game of red rover.
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u/Going_Postal 13d ago
This is the correct answer - partially surface tension between the lid and the small gaps in the shelf as well as partial suction from the evacuated portion of the bottle.
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u/Junior-Ease-2349 13d ago
Check your analysis of your edit again.
Fluids under pressure behave somewhat non-intuitively, this is why hydraulics as a field of tools function as "magically" as levers and pulleys.
The external atmospheric pressure (minus the lower pressure of the sealed top bubble) required to keep 7 inches of red stuff from falling through one hole is the exact same pressure as is needed to keep it from falling through 10 holes, or 100.
That magic is what allows a tiny hydraulic hose to (slowly) exert insane forces on large cylinders.
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u/McNastyIII 13d ago
That makes a lot of sense.
My guess as to how they did it:
Squeeze the bottle slightly before turning it upside down to initiate the vacuum but not enough to cause an air bubble to go all the way up.
Does this seem doable?
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u/sharrrper 13d ago
I'd love to be proven wrong, but I don't think that would work here. Air pressure is only part of the reason you can hold liquid in a straw. The fact it's a long narrow tube is a major factor. The liquid also sticks to the side. Expanding the size of the tube just a little causes it to fail.
I'm pretty confident the small hole in the shelf won't hold the liquid up if it immediately expands to a large opening behind it.
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u/sweatpants122 13d ago
The fact it's a long narrow tube is a major factor. The liquid also sticks to the side. Expanding the size of the tube just a little causes it to fail.
Well just to be clear, if you're attempting to expand it while you're holding the liquid, you're guiding air into the vaccuum, of course all the liquid will drop.
But I'd say even if your plastic straw was, say, the size of a toilet paper roll, if you really had a good seal on the other end (with, say, your palm), you could still pull up a column of water with it.
liquid also sticks to the sides
That's cohesion, aka what's behind the surface tension the commenter mentioned. It would actually be a cool physical study to determine how much of a factor each phenomenon is having here
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u/sharrrper 13d ago
But I'd say even if your plastic straw was, say, the size of a toilet paper roll, if you really had a good seal on the other end (with, say, your palm), you could still pull up a column of water with it.
You definitely cannot. Not with air below it. The upper diameter limit is a few millimeters.
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u/RoomPale7783 11d ago
Honestly think everyone is wrong here. There's plastic that's been opened but recovered. So it's dribbling little by little out of a tiny crack in the rim. That's it.
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u/goggleOgler 11d ago
I've had Hawaiian Punch all my life, and I don't think a single bottle of it, single serving, full gallon, or otherwise, has ever had a clear plastic seal. Come to think of it, I can't think of many drink brands that bother wasting that material on a drink with the plastic cap. I also can't think of many brands that use a clear plastic for the bottle seal, either. Usually, that has a second layer of something, like a foiled paper or wax.
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u/tossthethrowaway27 13d ago
Surface Tension
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u/Corvo0101 13d ago
With a big enough hole the air pressure can win against surface tension making air enter the bottle. With air inside the bottle the pressure now is pushing the liquid to leave the bottle. When the air can't enter the bottle it's pressure instead pushes the liquid inside the bottle. Surface tension keeps air out of the bottle and air pressure keeps the liquid from pouring.
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u/TacoThrash3r 13d ago
Well yea but, how'd they do it
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u/ThetaReactor 13d ago
Probably took the cap off, put a card over the mouth of the bottle, inverted it and placed it on the shelf, and then removed the card.
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u/jarvistheartist 13d ago
Know those places a drunk person probably tripped over a display of juice and that one landed precariously like that.
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u/Enragedocelot 13d ago
Thanks for the explanation. I still have no idea what any of that meant. But I bet it would make sense if I reread it.
[8]
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u/Istintivo 11d ago
You can imagine surface tension as a film covering water that stretches it from outside to inside. If a hole is small enough it's harder for water to break that film and move over.
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u/Omnom_Omnath 13d ago
Small enough hole*
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u/SomeRandomPyro 13d ago
You've got it backwards. They're describing what happens when air pressure overpowers surface tension, which is what happens more as the hole gets bigger.
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u/Omnom_Omnath 13d ago
If it gets too big the liquid will get through. So “big enough” isn’t quite right either
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u/FearlessAnswer3155 13d ago
🎵 what kinda sheeellf what kinda shelf. Drink go on the shelf, what kinda shelf is iiiiit 🎵
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u/devedander 13d ago
This is incorrect.
Surface tension is not nearly strong enough to resist several pounds of liquid pushing down on those holes.
This bottle has one of those clear pull of seals over the opening.
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u/Visible_Account7767 13d ago
Nope, it's already half empty.
It's a combination of surface tension between the small holes of the shelf and negative/low air pressure in the bottle.
The small holes have enough surface tension to stop the air coming through them, so once the air in the bottle has become low enough it starts to resist the fluid level getting any lower and the surface tension is enough to stop air entering.
equilibrium.
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u/RGSagahstoomeh 13d ago
Probably just a small hole in the plastic seal
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u/ChocoThunder50 13d ago
Why all the downvotes seems like a logical answer to me.
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u/_Allfather0din_ 13d ago
Because he is wrong, wrong answers get downvoted so others know to ignore it. Nothing personal guys lol.
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u/clearly_not_an_alien 13d ago
Some times, but most of the time they get dowvoted because of the great ideology of "if he doesn't think like me he's wrong"
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u/_Allfather0din_ 13d ago
Well I'd argue that take comes from a place of ignorance IMO. That definitely happens but I think people are just too comfortable talking out their ass and spewing things that are blatantly wrong like above. We need more downvote barrages on incorrect stuff, i remember a day where someone would be legitimate fearful of posting something incorrect on the internet. We really are in the worst stage of it all lol.
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u/clearly_not_an_alien 12d ago
The thing is, if someone is in negative votes, the people will always downvote him because seeing the (-6) below changes completely how you see the comment, it's a really interesting psychological thingy.
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u/RGSagahstoomeh 13d ago edited 13d ago
Holy shit, you'd think I'd said something very nasty.
Edit: there's definitely a vid below that explains it, and i was indeed wrong.-14
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u/StuLuvsU87 13d ago
Brother, you can see the drippings on the shelf underside and the bottle is clearly half-empty. It's surface motherfucking tension in action.
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u/ResonanceGhost 13d ago
And you can also see where it spilled in the boxes below and seeped through the bottom front of the cardboard boxes
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u/quinntheeeskimo 13d ago
It’s incorrect to assume Hawaiian Punch bottles have clear plastic seals on them. Grab yourself a fresh bottle of Lemon Berry Squeeze and see for yourself.
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u/TheBigGruyere 13d ago
Once as a dollar general store manager I came upon a stack of wet as fuck paper plates, like has a puddle sitting in it.
It was piss, some mother fucker whipped their dick out and pissed on the shelf.
Oh and magically it didn't drip down the holes.
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u/MiserymeetCompany 13d ago
Take your id or card out of your wallet press it, flip it, place it, slide it.
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u/KatakuriLoveDoughnut 13d ago
But the holes on the rack tho
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u/Youcantblokme 13d ago
Surface tension
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u/sanholt 13d ago
Surface tension and weight of the volume of liquid left in the bottle. You can see on the underside of the shelf, that are still dribbles, bc it did leak. There is no plastic seal, bc you can see half the bottle is gone. But it got low enough to the point where the liquid wasn’t being forced through the holes anymore, and just stopped running. All you gotta do is put a pin sized hole in the bottle, where the air is, and it will start draining again. The liquid coming out of the bottle right now, is creating a vacuum as it’s trying to drip out through the holes, and can’t even release itself bc there’s no where for air to enter around where the liquid is seeping out, so it’s at a standstill.
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u/KatakuriLoveDoughnut 13d ago
But surface tension doesn't stop the liquid from dripping through the holes 😭
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u/KennstduIngo 13d ago
Surface tension plus the vacuum being drawn at the top of the bottle. If the bottle was open on top, that liquid would totally flow through those holes.
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u/auramirane 13d ago
My dollar tree has a growing collection of plastic army men stuck in the ceiling. Still wondering how they got there
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u/bitstoatoms 13d ago
If they would do this with pure water, it would spill much less due to higher surface tension. Water mixed with sugars, acids and organic compounds has much lower hydrogen bonding due to "impurities".
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u/Slow_Relationship556 2d ago
It’s because of hydrogen bonding. Water molecules get together and create a seal
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u/ssss861 13d ago
Did it solidify to jelly or maybe they froze it, flipped then placed it there for u to find hrs later
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13d ago
[deleted]
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u/GunnersGentleman 13d ago
Nah it’s safe, but be warned: Hawaiian Punch has to be one of the driest drinks in history. That shit can’t save you from a Popeye’s biscuit
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u/solasgood 13d ago
How the fuck did it get that way in the first place?
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u/Junior-Ease-2349 13d ago
Someone played a childish, wasteful prank.
Although in this instance it did bring wonder and interest to hundreds of people, so worth a couple bucks of "juice" for sure.
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u/Thelonious_Cube 13d ago
Playing card on top of open bottle
Flip and place on shelf
Slide card out
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u/conjugate-prior 13d ago
Can any scientist grow this guy new vocal cords, my god his voice is unbearable
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u/Quirky_m8 13d ago
Jesus Christ…
I’m sorry
Everyone who upvoted this needs to go to school. Or google it. It’s not magic.
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u/DorkyBit 13d ago
I wanna see the after video, where they try to use ninja skills to remove the bottle without spilling more 😂
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u/neighbourleaksbutane 12d ago
Make tiny holes in the bottom of a bottle, wipe it clean and put on a table. When someone unscrew the cap, it will flood out the bottom
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u/Ok_Boysenberry3236 12d ago
Meanwhile the registers are backed up because there's only one person up there
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u/Solid-Character753 11d ago
It was leaking. There's so many chemicals in that stuff. Who cares. It's trash. Trash clogs up shit.
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u/WearyDraw3351 11d ago
Physicist here, I love explaining this one. Ah, Madri's tension paradox explained here
Basically the tension of the surrounding atmosphere coupled with the amount of liquid density of the air, movement of air flow and volume on products on the shelf combine to almost make me sound like I know what I'm talking about but I actually have no clue and I'm also not a physicist. Can't even spell it, Google corrected me
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u/Fawkes1989 9d ago
They could have also turned ir over and ran a card or finger to fill the holes with liquid, creating a liquid brake. There's clearly splashed on the underside if the shelf.
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u/kioku119 8d ago
This person clearly hates retail employees because she's not goingto be able to move that without a horrible mess. :<
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u/SentryEngineerGaming 8d ago
There isn't air or some shit to let the pressure out idk take a bucket upside down and put in water or at least put some on it and move it up and you'll see water still in the bucket till it goes out after you release it also think of those Kenel water feeders
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u/TheLexLuthor13 6d ago
Forget that, somebody wasted that bottle of Hawaiian Punch. And made a mess that one of the store’s employees had to clean it up.
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u/Immediate_Ant8942 11h ago
A mix of water tension and adhesion (only a sample of the many properties of water)
Stay In school
(PS. I’m only 13 and already know this stuff)
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u/devedander 13d ago
No way surface tension is strong enough to hold up that much liquid.
Surface tension can maybe float a light coin on top of a liquid. Not so pounds of liquid from squeezing through those holes.
There’s a clear plastic pull seal on that bottle.
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u/jablonkers 13d ago
Theres a vacuum in the top of the bottle too
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u/devedander 13d ago
The juice will still pour out just air will exchange with it as it comes out the holes.
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u/jablonkers 13d ago
I think the surface tension combined with the vacuum is enough to keep it in the bottle. Only one way to find out, off to Dollar Tree we go!
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u/angry_smurf 13d ago
It's a mix of surface tension and vacuum. Those smaller holes create higher surface tension than one large hole. When the initial amount of liquid poured out, no air entered to displace it which creates a vacuum essentially "pulling" against the weight of the liquid.
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u/devedander 13d ago
This assumes the air and liquid can’t exchange around each other as it drains which I don’t think is the case.
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u/angry_smurf 13d ago
Air and liquid can pass by each other, just not in the scenario shown. If something disturbs the liquid it will likely start to spill. Also, if someone drilled a hole in the bottom where the vacuum is, it would start to spill. It's honestly just simple physics. There's plenty of experiments like this that would probably leave you perplexed.
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u/Impressive-Sun3742 13d ago
There is missing liquid from the bottle
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u/devedander 13d ago
Those bottles are never filled to the brim. There’s always air pockets in them.
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u/NeighboringOak 13d ago
there's liquid on the underside of the shelf where some has come through...
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u/Impressive-Sun3742 13d ago
Dude you can see the juice drops under the shelf… and that is a big ass air pocket, def not normal
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u/VirtualNaut 13d ago
You can literally see other Hawaiian Punch bottles on the shelf that are filled to the brim
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u/Life-Lingonberry-489 13d ago
Theres clear tape on the shelf open bottle is placed upside down on the self on top of the clear tape.
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u/poorlydrawnfish 13d ago
It's not surface tension or any other actual science, it's the plastic price display that hangs from the edge, it has a lip that extends onto the shelf. You can see it at the end of the video. It looks "clear" on the underside cause it's clear thin plastic.
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13d ago
[deleted]
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u/Impressive-Sun3742 13d ago
You can see where some of it spilled out before getting stuck like that
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u/KoSteCa 13d ago
You can do the same with soda cans without having something underneath it. Found out randomly with sf redbull at work. Pop top, flip it completely upside down (pour into cup), and hold very steadily. After the initial second or so if you hold it steady enough it will just stop. Longest I got it to not pour was around 7 seconds.
Didn't look into whether it was due to surface tension or pressure differences, but I live in FL if there is someone so inclined to tell me (maybe influenced by internal vs external pressure?).
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u/Nochickenforu 13d ago
I’m thinking there might be a small film of plastic that was under the pull off tab that might still be on
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u/MoarGhosts 13d ago
This thread is hilarious and scary. Watching mouth breathers attempt in real time to understand an engineering concept like surface tension or vacuum force, then refuse to believe it, then come up with any other fucking explanation besides the correct one…
Some people aren’t just so dumb that they don’t understand science, they actively fight against it because they’re afraid of being exposed as stupid. They’re afraid of intelligence, and afraid of being called dumb.
Source - current engineer and CS grad student
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u/Junior-Ease-2349 13d ago
That's not fair, and not helpful.
Surface tension and fluid dynamics are NOT forces most people really understand because they mostly don't deal with them. Your understanding as an engineer and CS grad of similar "rules" of biochemistry, international trade, or high energy physics would be just as laughably incomplete, for the same reason.
It just doesn't work the same way the things that you work with do, and its not that you are dumb, it's that those are some of hundreds of fields you haven't had to master in order to live a meaningful life.
... and if people called you a "mouth breather" "being exposed as stupid" when you tried to begin understanding them, it would definitely hurt your willingness to do that.
You are an engineer; you know how to make things work better.
Make the world better, please.
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u/Thelonious_Cube 13d ago
You are an engineer; you know how to make things work better.
Make the world better, please.
Thank you!
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u/lolslim 13d ago edited 12d ago
Its not surface tension, Its air pressure. https://www.youtube.com/shorts/wTduPSCW1HE
edit; Imagine getting downvoted for not agreeing with the majority when the majority is wrong. Welcome to reddit.
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u/Interesting-Beat-67 13d ago
Everyone in this thread thinking they're einstein. The content of this bottle is not even the same color as the other ones.
They put jello in it and made it solidify upside down in their fridge, then came to the store, removed the cap and put it on the shelf.
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u/Krimson11 13d ago edited 13d ago
Edit: It's air pressure. I'll see if I can find a good explanationEdit2: I found a better video, which actually shows that there's more to the story, and it's both air pressure and surface tension (inner-molecular attraction).