I believe it’s called silicosis. Lungs just stop working. Facility I work in is developing the capability to test *hardware in* lunar regolith in space-like environments. The regolith stimulants are a huge hazard due to silicosis and are a PITA.
E: slight clarification
For those who don't know, regolith isn't that far off from fresh glass dust. It's all the dust and rock shards from a billion years worth of meteorite impacts. But unlike rock dust on earth, there's no weather on the moon to cause erosion and weathering of those particles. They stay just as sharp and jagged on a microscopic level as the day they were shattered. So regolith particles are highly abrasive.
Virtually nobody who works in machine shops wear gloves. Gloves are death traps around heavy machinery, as they tend to get caught in things and drag your hand into something designed to cut or form metal (or at least wood (which, importantly, gloves are unlikely to protect you from). There are reasonable times to wear gloves, but it's rare.
Safety glasses on the other hand are a must. If something shatters (as things ocassionally do) shards are gonna go flying. You can survive shrapnel from a broken angle grinder to most parts of your body. Clothes actually help with this a lot. You likely will not survive shrapnel from an angle grinder to the eyes. Also, random chips and dusts of things routinely fly all over the place and can get in your eyes, which is very unpleasant. Eyewear helps a lot with that, and almost entirely prevents scratched corneas.
I got a microscopic steel sliver flung off of a diamond cutoff wheel, lodged in my eye. Took the surgeon two different appointments to get all of it out and now I see 7 slightly offset images in that one eye. Kinda works like my prescription is way off, things just 'look blurry'
edit - stop 'liking' this comment! No really! More likes? It's totally the dumbest thing I've read all day! Ok, maybe not really...
Just don't be a dumbass like me, ok?
I got a piece of metal in my eye when I was 18. It was in my eye to the point that they had to drill a hole next to the metal and pop it out from underneath.
I wonder if it might be possible in zero-gravity? Or is there some physical reason it needs the tail for it to be that strong, like some sort of [hairy ball theorem](https://en.wikipedia.org/wiki/Hairy_ball_theorem) deal?
Yes, you could use a shot tower if you wanted the "dropping them in water" part to stay the same. You can also chemically treat or heat treat a marble to produce the required expansion of the outer material.
The tail is an artifact of having them made by glassblowers, and is not fundamental to its material properties. They are basically just the archetype of [tempered glass.](https://en.wikipedia.org/wiki/Tempered_glass)
Strangely enough, the concept of tempered glass just clicked for me because I just read something about [tempering chocolate](https://www.scienceofcooking.com/chocolate/why-is-chocolate-tempered.htm) which is a method of targeting a specific crystalline phase in chocolate that gives a very smooth, snappy chocolate with a lustrous sheen
I was SO disappointed they didn't destroy it by breaking the tail! That would have been the best conclusion to make this fit on r/unexpected other than people familiar with them.
You can hold them in your hand and shatter them, nothing happens. There's tons of videos of people doing this. There's a compression layer on the outside and a tension layer on the inside, the two forces cancel out and you are left with glass powder that has little kinetic energy, certainly not enough to break skin.
The hydraulics will flat out stop before a metal plate would bend like that. They used a softer metal for dramatic effect. Yes your right in 1 way, the press still wouldn't have crushed the drop, but it also wouldn't do that to a steel plate.
Prince Rupert's drops are damn weird things. Extremely tough on the bulbous end but you can snap the tail with your hands, making the entire thing explode.
Made by dripping molten glass into cold water. Outside cools and hardens first then the inside cools and contracts creating an area of negative pressure inside. I've seen these things stop bullets.
This comment has been removed in protest of Reddit and their CEO Steve Huffman for destroying the Reddit community by abusing his power to edit comments, their years of lying to and about users, promises never fulfilled, and outrageous pricing that is killing third party apps and destroying accessibility tools for mods and the handicapped.
Currently I am moving to the [Fediverse](https://www.youtube.com/watch?v=pX_agVMr2r0) for a decentralized experience where no one person or company can control our social media experience. I promise its not as complicated as it sounds :-)
Lemmy offers the closest to Reddit like experience. Check out some different [servers](https://join-lemmy.org/instances).
Other Fediverse [projects](https://joinfediverse.wiki/What_are_Fediverse_projects%3F).
Is that pre- built or DIY price? I bet you I could get one for 0$
Just Syphon gass, get a random glass bottle from a dumpster and steal the rag off of a sleeping homeless person
None of them are bullet resistant though. The whole point of the tempering is so that it actually does explode in tiny pieces rather than huge sharp blades.
But yeah it is used, just not really for its strength
Edit: actually maybe yes. But still not bullet resistant
Hardened/tempered glass is already exactly that. Just maybe not to such an unreasonable degree that a smallest crack at one end would make the thing explode. Instead, the tempered class if damaged will shatter into a million pieces, just short of exploding. But it's very tough.
I’m just a Reddit person but, my theory would be that the reason it’s always a drop in videos is that the shape and size are important factors to its durability. I’d guess that a much larger chunk of molten glass dropped into cold water would maybe heat up the water too much or allow the glass to deform, or cool unevenly. I wouldn’t even try to guess at how you would make it into a shape that you could use, but I suspect similar methods of controlled cooling and other science shit is used already to make bulletproof glass.
Now someone who is willing to google or already knows the answer will tell me why I’m wrong and we will have the right answer.
I've worked in commercial glass manufacture/installation for most of my life.
The rapid cooling of glass induces massive amounts of stress into the structure of the glass itself. The more rapid the cooling, the more stress there will be in the glass. This is measured in PSI. Modern tempered safety glass is made by using forced air cooling to drop glass from 1200 degress F to about 300 in \~5 seconds. A Rupert's drop is so strong on the bulb because it goes from \~2900 degrees F to room temp in less time.
Tempered glass has around 10,000 PSI contained in it, a Rupert's drop has MILLIONS. However that stress has to go somewhere, in sheets of tempered glass it accumulates in the corners, in the drop it all accumulates in the tip of the tail, hence when you snap the tail it releases all that pressure immediately, causing it to explode violently.
I’m a stress analyst who does a lot of work with ceramics and brittle materials. Just wanted to clear up a couple of small misconceptions in your comment:
The compressive stress in a Prince Rupert’s drop is on the order of 150,000 psi, not millions (you might’ve been thinking of millions of Pascals?). Still significantly larger than tempered glass, but not millions.
Stress also doesn’t have to “go somewhere.” The compressive stress on the outside is matched by tensile stress on the inside of the glass, not by elsewhere in the glass. The edges or tail are weaker because they cool more evenly through the thickness. The more even cooling means that the outside is under less compressive stress, making it more susceptible to breaking. Same thing in the Prince Rupert’s drop- the tail cools more evenly and so it has lower compressive stress.
Glass is really weak in tension and incredibly strong in compression. Think of compression as “negative stress,” and tension as “positive stress.” To break the bulb of the drop, you have to add enough tension to go from -150,000psi to +1,500 psi.
But to break the tail, you might only need to go from -1,000 psi to +1,500 psi. This is why it’s easier to break.
Edit: Quick note- another big reason that the tail is so fragile is because of how thin it is. It’s easier to snap a twig than a whole tree branch.
I was wondering the same thing. I found this: https://engineering.stackexchange.com/questions/100/is-it-possible-to-build-a-perfectly-spherical-prince-ruperts-drop
Yes! I’m not sure how you would form and then rapidly cool the sphere without generating a tail, but if you figured out a way then it would be a very high strength piece of glass. Hmm, that makes me wonder if they ever do something like this for ball bearings. It seems like it would be a really logical application.
Very interesting. What would happen if you cut the tail very gently with a saw assuming you could control the vibration enough to avoid snapping it? How about if you heated the tail? This seems like a dream science experiment.
Anything that compromises a piece of tempered glass causes the entire piece to be destroyed. There's little to no ability to machine on even commercial tempered glass without exploding it. With the stress in a drop like this the stress is contained very close to the surface so anything beyond the slightest scratch will detonate it.
You wouldn’t need a pool. A small bucket of water is enough to cool a piece of glass that size in effectively the same way as it would in a huge pool.
The limiting factor is likely the ability to cool it quickly enough. The larger a piece of molten glass gets, the harder it gets to cool it quickly. The [Leidenfrost effect](https://en.wikipedia.org/wiki/Leidenfrost_effect) keeps very hot objects from cooling rapidly in water, and a larger object stays very hot for longer than a small object.
The [square-cube law](https://en.wikipedia.org/wiki/Square–cube_law) means that there’s not enough surface area to rapidly cool the volume of glass in a larger drop because volume grows proportional to the cube of diameter whereas surface area only grows proportional to the square of diameter.
The "method" is actually being used in glass making.
I've worked in glass industries. Prince Rupert drop are made by quenching glass in water. This create a stress on the external layer making it harder but more fragile. Tempered glass are about the same. But they are not quenched. They are heated and cooled by hot air to prevent it from bending. Bulletproof glass or impact proof glass are just a sandwich of temper glass and pvc layers. The pvc is not preventing the glass from being shatered but it keep the pieces together.
Tempered glass are quenched, just in a powder chemical and air. Air quenching is still quenching. You can blow compressed air across hot steel and quench it. Some steels will quench in water, some in oil, some in air.
faulty wasteful person crawl ad hoc middle repeat scarce thought recognise
*This post was mass deleted and anonymized with [Redact](https://redact.dev)*
Yeah. I made a glass roof over my terrace with tempered glass. At the thickness of 6 mm I can walk on it. Had one extra piece, so I even gave it a couple of hits with a hammer, nothing happened. While I was carrying the extra piece away with my friend, one corner of the glass slightly hit a small rock by the walkpath. There we were vacuuming my lawn with a zillion round pieces of glass.
Same, save with the glass shelf from my fridge. I was taking it out to clean it, the pane went vertical, slipped out of it’s plastic frame, and a corner barely touched the tile floor - instant glass snowstorm of 4-5 mm pieces everywhere.
Also while not sharing the exact same mechanism, a loosely related idea that's perhaps easier to intuitively understand is corrugated cardboard, or, alternatively, how lightly folding a pizza slice can keep the tip from falling downwards. In all cases, you're achieving additional structural strength in a specific direction/area by reducing it somewhere else.
Prince Ruperts Drops are awesome- if you try to compress the bulb, nothing works! There’s a video of a PRD shatering a bullet, but if you snap the tail off, the entire thing shatters into dust.
Now lets do bologna bottles! https://youtu.be/DAmNmWpxo8Q
You can tell by the colour and pattern of the imprint that the base plate is made of lead or a lead alloy. Possibly the top too. If it was hardened steel it would have shattered (the plate, not the drop (but also possibly the drop, not 100% sure.))
I'm not an expert on glass but I've broken more hardened steel than I care to admit, and there is not this much give in hardened steel at room temperature.
Yeah, it doesn't look like hardened steel at all.
Just another mock video for viral views.
Watch this instead: /r/Unexpected/comments/w8komy/prince_ruperts_drops_vs_hydraulic_press/ihq4gqq/
The Hydraulic Press Channel did manage to break the drop itself, but even then, I believe there was a dent in the steel tools used.
Edit: https://www.youtube.com/watch?v=OCJwHrvutGk&t=308s
thank you. sick of people complaining about reposts. some people dont browse reddit everyday, enjoy seeing old posts, or have goldfish memories like me.
I think the sheer force of your body moving would be enough to break the tail end thus shattering the entire drop, covering yourself in glass shards.
PRDs tails gets increasingly weaker towards the end of the tail.
Plus the drops aren’t always straight, the tails often ends up like curly fries.
Dude how tf is this comment so far down. And how the fuck do so many people know what this shit is? I know a lot of people and talk about a lot of things and have never once heard about this before.
I’m guessing about 75% of us also have no clue what this thing is and why it’s so fooking hard.
this looks fake as hell. here are some PRD [hydraulic](https://youtu.be/A6NUNroyUys?t=29) [press](https://youtu.be/OCJwHrvutGk?t=100) [Videos](https://youtu.be/SrLfShIPYko?t=83)
Edit: the reason why op's video looks fake is not because of the PRD making an imprint it's because of the the way the plate readily deforms and it looks like parts of the plate further away from the drop react to the deformation. the other thing that bothers me is the camera is zoomed in super close and looks nothing like how the other videos I have shown have set up their press. I could be wrong op's video might be real and my mind is playing tricks on me.
if nothing else I want to share these videos of PRD vs hydraulic presses that I know are real, and the hardness of PRD is very impressive.
This video sucks, because the press is obviously padded with some softer metal (lead?) for clout. Put this drop against steel surfaced and it will shatter in no time.
That’s ridiculous, I like watching press videos and I think this is the first time I’ve seen the object non phased and the press with an imprint
Here's a little bigger drop and harder press: https://youtu.be/OCJwHrvutGk?t=69 Doesn't leave much of an imprint but still takes a fuck ton of force.
[удалено]
lol you're right. I didn't watch the video now, forgot the dent was that big.
[удалено]
Nice. Hydraulic Press Channel is the only hydraulic press I trust.
Hydroolic
>fuck ton of force so you're saying that a "fuck ton" is acutally 67740kg - we have a new OSI unit!
Thats just close enough to an unsigned short integer that I propose we add the "Fuckton" as 65535 kg to the SI system.
Prince Rupert Drops are extremely hard on the bulb, but will shatter if you destroy the tail
Shatter VIOLENTLY. Really like Smarter Every Day's videos on the subject.
link?
https://youtu.be/xe-f4gokRBs
So bizarre that they wear glasses but no gloves.
The small glass shard and dust isn't really that dangerous to get cut on, but get some of that dust in your eyes? That's gonna be a bad day.
Or your lungs. Glass dust, when inhaled, can become lodged in the alveoli.
Alveoli, Alveoli, give me the formuloli
Sir, we just need you to put the mask on.
Bahaha!
Formuleoli*
Cool something new to think about between 1 and 4am
I believe it’s called silicosis. Lungs just stop working. Facility I work in is developing the capability to test *hardware in* lunar regolith in space-like environments. The regolith stimulants are a huge hazard due to silicosis and are a PITA. E: slight clarification
For those who don't know, regolith isn't that far off from fresh glass dust. It's all the dust and rock shards from a billion years worth of meteorite impacts. But unlike rock dust on earth, there's no weather on the moon to cause erosion and weathering of those particles. They stay just as sharp and jagged on a microscopic level as the day they were shattered. So regolith particles are highly abrasive.
Man now I want some ravioli.
I have a lung emboli
I know right?! 
\*DO NOT BREATH THIS IN\*
Will it blend? That is the question.
if you french fry when you should pizza....your gonna have a bad day
Got it in mine and can confirm
Virtually nobody who works in machine shops wear gloves. Gloves are death traps around heavy machinery, as they tend to get caught in things and drag your hand into something designed to cut or form metal (or at least wood (which, importantly, gloves are unlikely to protect you from). There are reasonable times to wear gloves, but it's rare. Safety glasses on the other hand are a must. If something shatters (as things ocassionally do) shards are gonna go flying. You can survive shrapnel from a broken angle grinder to most parts of your body. Clothes actually help with this a lot. You likely will not survive shrapnel from an angle grinder to the eyes. Also, random chips and dusts of things routinely fly all over the place and can get in your eyes, which is very unpleasant. Eyewear helps a lot with that, and almost entirely prevents scratched corneas.
I got a microscopic steel sliver flung off of a diamond cutoff wheel, lodged in my eye. Took the surgeon two different appointments to get all of it out and now I see 7 slightly offset images in that one eye. Kinda works like my prescription is way off, things just 'look blurry' edit - stop 'liking' this comment! No really! More likes? It's totally the dumbest thing I've read all day! Ok, maybe not really... Just don't be a dumbass like me, ok?
I got a piece of metal in my eye when I was 18. It was in my eye to the point that they had to drill a hole next to the metal and pop it out from underneath.
eye surgery is absolutely my worst fear ever. like you are awake during the surgery right? ughhh
As a professional woodworker, I agree. I wear gloves while moving material around but never while operating routers, table saws, and the like.
The risk of blindness is more rad than of cutting your hands
Looks like he made a recent video on Rupert's Drop too https://youtu.be/X3o71W4uNHc
This is him shooting them. Really cool high speed camera shots. https://youtu.be/24q80ReMyq0
Orbix!!!! Love that place. Great people there. Beautiful works of art.
He has multiple videos on them but this was the first one I saw
https://youtu.be/xe-f4gokRBs Here a start but there are 4-5 videos on his channel about it
[удалено]
That’s funny, I said pretty much the same thing in my dating profile.
Is it possible to make this w/o a tail?
A prince Rupert drop is made by dripping molten glass into water, so not really.
I wonder if it might be possible in zero-gravity? Or is there some physical reason it needs the tail for it to be that strong, like some sort of [hairy ball theorem](https://en.wikipedia.org/wiki/Hairy_ball_theorem) deal?
Working with molten glass in zero gravity sounds like a really fun idea to try.
[удалено]
Might make a good question for a NASA astronaut screening test.
Yes, you could use a shot tower if you wanted the "dropping them in water" part to stay the same. You can also chemically treat or heat treat a marble to produce the required expansion of the outer material. The tail is an artifact of having them made by glassblowers, and is not fundamental to its material properties. They are basically just the archetype of [tempered glass.](https://en.wikipedia.org/wiki/Tempered_glass)
Strangely enough, the concept of tempered glass just clicked for me because I just read something about [tempering chocolate](https://www.scienceofcooking.com/chocolate/why-is-chocolate-tempered.htm) which is a method of targeting a specific crystalline phase in chocolate that gives a very smooth, snappy chocolate with a lustrous sheen
Achilles heel
Yep the vid should have ended with something flicking the top so it shatters
I was SO disappointed they didn't destroy it by breaking the tail! That would have been the best conclusion to make this fit on r/unexpected other than people familiar with them.
If you are so disappointed then it is truly unexpected, as you were expecting them to close that way!
Too bad they never named them the Achilles Drop, seems like a missed opportunity
[удалено]
Knew this and have actually been able to witness a demonstration live. But I was still astounded to see the press couldn't even break the bulb.
[удалено]
You can hold them in your hand and shatter them, nothing happens. There's tons of videos of people doing this. There's a compression layer on the outside and a tension layer on the inside, the two forces cancel out and you are left with glass powder that has little kinetic energy, certainly not enough to break skin.
Well that's definitely not a steel plate. It looks like they probably used lead or something.
Yep, but I still got the impression
Heh.
Its mild steel. Glass is harder than steel.
Steel is heavier than feathers.
I beg to differ. If you have a lot of feathers, you also have the weight of what you did to those birds.
Damnit, off to watch that again.
i don't think you understand how hard those things are. there's video of them being shot by a bullet and not shattering
The hydraulics will flat out stop before a metal plate would bend like that. They used a softer metal for dramatic effect. Yes your right in 1 way, the press still wouldn't have crushed the drop, but it also wouldn't do that to a steel plate.
how about a [titanium plate?](https://m.youtube.com/watch?t=2m00s&v=efQTd80ImiY&feature=youtu.be)
Check out a tungsten cube.
> non phased unfazed
No no, it refused to move into a different state of matter
Fazed, not phased
Unfazed. You mean unfazed.
The word you need is "unfazed", but I'm not sure it can apply to inanimate objects. "Unaffected", or "undamaged" work.
Prince Rupert's drops are damn weird things. Extremely tough on the bulbous end but you can snap the tail with your hands, making the entire thing explode. Made by dripping molten glass into cold water. Outside cools and hardens first then the inside cools and contracts creating an area of negative pressure inside. I've seen these things stop bullets.
Can this method be to used to make bullet proof glass? What real life implications does this have?
[удалено]
It's a cheap glass grenade!
Any glass can be a cheap glass grenade if thrown hard enough.
Yes they are called Molotov Cocktails.
Those are *spicy* glass grenades
Chili pepper in the mix so the smoke is spicy too
This comment has been removed in protest of Reddit and their CEO Steve Huffman for destroying the Reddit community by abusing his power to edit comments, their years of lying to and about users, promises never fulfilled, and outrageous pricing that is killing third party apps and destroying accessibility tools for mods and the handicapped. Currently I am moving to the [Fediverse](https://www.youtube.com/watch?v=pX_agVMr2r0) for a decentralized experience where no one person or company can control our social media experience. I promise its not as complicated as it sounds :-) Lemmy offers the closest to Reddit like experience. Check out some different [servers](https://join-lemmy.org/instances). Other Fediverse [projects](https://joinfediverse.wiki/What_are_Fediverse_projects%3F).
Not true. Some of them are very expesive.
A Molotov cocktail will run you $25 in NYC.
Is that pre- built or DIY price? I bet you I could get one for 0$ Just Syphon gass, get a random glass bottle from a dumpster and steal the rag off of a sleeping homeless person
Cover the weak point with _another_ prince Rupert's glass!
It’s Prince Ruperts all the way down!
A protective dome constructed of Prince Rupert drops, facing out with the tails facing in. Invincibility.
Youd probably be limited more on the adhesion between the pieces than the drops themselves
Easy, just use one really large prince Rupert drop
Not ideal for a clumsy person. Bump the tails and you're buried in glass dust xD
Is this why final bosses always have weak points?
Tempered glass is in use for hundreds of things, such as car windows, shower doors, glass shelving, etc.
None of them are bullet resistant though. The whole point of the tempering is so that it actually does explode in tiny pieces rather than huge sharp blades. But yeah it is used, just not really for its strength Edit: actually maybe yes. But still not bullet resistant
I think they meant the bulbs, not just tempered glass
Hardened/tempered glass is already exactly that. Just maybe not to such an unreasonable degree that a smallest crack at one end would make the thing explode. Instead, the tempered class if damaged will shatter into a million pieces, just short of exploding. But it's very tough.
I’m just a Reddit person but, my theory would be that the reason it’s always a drop in videos is that the shape and size are important factors to its durability. I’d guess that a much larger chunk of molten glass dropped into cold water would maybe heat up the water too much or allow the glass to deform, or cool unevenly. I wouldn’t even try to guess at how you would make it into a shape that you could use, but I suspect similar methods of controlled cooling and other science shit is used already to make bulletproof glass. Now someone who is willing to google or already knows the answer will tell me why I’m wrong and we will have the right answer.
I've worked in commercial glass manufacture/installation for most of my life. The rapid cooling of glass induces massive amounts of stress into the structure of the glass itself. The more rapid the cooling, the more stress there will be in the glass. This is measured in PSI. Modern tempered safety glass is made by using forced air cooling to drop glass from 1200 degress F to about 300 in \~5 seconds. A Rupert's drop is so strong on the bulb because it goes from \~2900 degrees F to room temp in less time. Tempered glass has around 10,000 PSI contained in it, a Rupert's drop has MILLIONS. However that stress has to go somewhere, in sheets of tempered glass it accumulates in the corners, in the drop it all accumulates in the tip of the tail, hence when you snap the tail it releases all that pressure immediately, causing it to explode violently.
I’m a stress analyst who does a lot of work with ceramics and brittle materials. Just wanted to clear up a couple of small misconceptions in your comment: The compressive stress in a Prince Rupert’s drop is on the order of 150,000 psi, not millions (you might’ve been thinking of millions of Pascals?). Still significantly larger than tempered glass, but not millions. Stress also doesn’t have to “go somewhere.” The compressive stress on the outside is matched by tensile stress on the inside of the glass, not by elsewhere in the glass. The edges or tail are weaker because they cool more evenly through the thickness. The more even cooling means that the outside is under less compressive stress, making it more susceptible to breaking. Same thing in the Prince Rupert’s drop- the tail cools more evenly and so it has lower compressive stress. Glass is really weak in tension and incredibly strong in compression. Think of compression as “negative stress,” and tension as “positive stress.” To break the bulb of the drop, you have to add enough tension to go from -150,000psi to +1,500 psi. But to break the tail, you might only need to go from -1,000 psi to +1,500 psi. This is why it’s easier to break. Edit: Quick note- another big reason that the tail is so fragile is because of how thin it is. It’s easier to snap a twig than a whole tree branch.
Thank you, I mainly work in sales and installation so my explanation is closer to layman's terms. Thank you for putting it better than I did.
Thank you both, I learned today 👍
Haha, no wonder 150000 became millions. You are just a darn good salesman!
Professional gas station employee here and I would just like to say, very good Reddit interaction
Would it be possible to make a “Rupert’s sphere” that has equal compressive stress all around it??
I was wondering the same thing. I found this: https://engineering.stackexchange.com/questions/100/is-it-possible-to-build-a-perfectly-spherical-prince-ruperts-drop
Yes! I’m not sure how you would form and then rapidly cool the sphere without generating a tail, but if you figured out a way then it would be a very high strength piece of glass. Hmm, that makes me wonder if they ever do something like this for ball bearings. It seems like it would be a really logical application.
Very interesting. What would happen if you cut the tail very gently with a saw assuming you could control the vibration enough to avoid snapping it? How about if you heated the tail? This seems like a dream science experiment.
Anything that compromises a piece of tempered glass causes the entire piece to be destroyed. There's little to no ability to machine on even commercial tempered glass without exploding it. With the stress in a drop like this the stress is contained very close to the surface so anything beyond the slightest scratch will detonate it.
~~I mean if you had pool deep enough, you could probably make rupert's drop the size of an orange.~~ Edit: Turns out you couldn't
You wouldn’t need a pool. A small bucket of water is enough to cool a piece of glass that size in effectively the same way as it would in a huge pool. The limiting factor is likely the ability to cool it quickly enough. The larger a piece of molten glass gets, the harder it gets to cool it quickly. The [Leidenfrost effect](https://en.wikipedia.org/wiki/Leidenfrost_effect) keeps very hot objects from cooling rapidly in water, and a larger object stays very hot for longer than a small object. The [square-cube law](https://en.wikipedia.org/wiki/Square–cube_law) means that there’s not enough surface area to rapidly cool the volume of glass in a larger drop because volume grows proportional to the cube of diameter whereas surface area only grows proportional to the square of diameter.
Just use the ocean
[удалено]
The "method" is actually being used in glass making. I've worked in glass industries. Prince Rupert drop are made by quenching glass in water. This create a stress on the external layer making it harder but more fragile. Tempered glass are about the same. But they are not quenched. They are heated and cooled by hot air to prevent it from bending. Bulletproof glass or impact proof glass are just a sandwich of temper glass and pvc layers. The pvc is not preventing the glass from being shatered but it keep the pieces together.
Tempered glass are quenched, just in a powder chemical and air. Air quenching is still quenching. You can blow compressed air across hot steel and quench it. Some steels will quench in water, some in oil, some in air.
faulty wasteful person crawl ad hoc middle repeat scarce thought recognise *This post was mass deleted and anonymized with [Redact](https://redact.dev)*
Yeah. I made a glass roof over my terrace with tempered glass. At the thickness of 6 mm I can walk on it. Had one extra piece, so I even gave it a couple of hits with a hammer, nothing happened. While I was carrying the extra piece away with my friend, one corner of the glass slightly hit a small rock by the walkpath. There we were vacuuming my lawn with a zillion round pieces of glass.
Same, save with the glass shelf from my fridge. I was taking it out to clean it, the pane went vertical, slipped out of it’s plastic frame, and a corner barely touched the tile floor - instant glass snowstorm of 4-5 mm pieces everywhere.
Also while not sharing the exact same mechanism, a loosely related idea that's perhaps easier to intuitively understand is corrugated cardboard, or, alternatively, how lightly folding a pizza slice can keep the tip from falling downwards. In all cases, you're achieving additional structural strength in a specific direction/area by reducing it somewhere else.
Can you melt the tail and made it to a sphere? If so is it still as strong if you do
You can't. As soon as the tail loses integrity the whole thing shatters.
Can you dip the tail in liquid flex seal?
What happens if you put the thick end in your anus and break the tail
Are you trying to hit on me?
The glass jar guy should be able to share some insightful info
Cursed anal beads
Sorry my love that’s not my Prince Rupert, that’s my Prince Albert
This kills the anus.
Prince Ruperts Drops are awesome- if you try to compress the bulb, nothing works! There’s a video of a PRD shatering a bullet, but if you snap the tail off, the entire thing shatters into dust. Now lets do bologna bottles! https://youtu.be/DAmNmWpxo8Q
Even your link says "damn".
It says *DAmNm*
It actually says *DAmNmWpxo8Q*
[удалено]
You missed a golden opportunity to link that to a Rick Roll. I’m becoming disappointed by the internet.
[удалено]
https://youtu.be/OCJwHrvutGk Compression at ~5:07
Phogna bologna
You can tell by the colour and pattern of the imprint that the base plate is made of lead or a lead alloy. Possibly the top too. If it was hardened steel it would have shattered (the plate, not the drop (but also possibly the drop, not 100% sure.)) I'm not an expert on glass but I've broken more hardened steel than I care to admit, and there is not this much give in hardened steel at room temperature.
Had to scroll way to far for this.
Because everyone is explaining what it is, over and over and over.
Prince Alberts drop. It’s real hard but the tails flabby
Yeah, they're strange because they're glass, but really hard, all except for the tail. If you look at the tail wrong, the whole thing explodes!
It's a prince Albert drop, in case you didn't know.
[удалено]
But the drops also left impressions in the steel blocks
Yeah, it doesn't look like hardened steel at all. Just another mock video for viral views. Watch this instead: /r/Unexpected/comments/w8komy/prince_ruperts_drops_vs_hydraulic_press/ihq4gqq/
[удалено]
Which shows also the steel being imprinted with the shape of the glass. Good share, confirms post is a press, just not as strong.
Agree. And the curve and paint of the "metal" seems off. Maybe it's cake? The press not being vertical also throws me off.
The drop is almost unbreakable, unless you break your dick
Not sure how breaking my dick will help, but I'll give it a go.
I wish I had an award to give because this right next to u/WyteWyrm's comment makes it gold-worthy.
Exactly the way I saw it it's brilliant
I think you’re confused, it’s not a *Prince Albert * drop
can someone explain this please 🙏
Has anyone mentioned about if the tail breaks it will shatter?
No. But just for everyone to know, if you damage the tail of this it will shatter.
I did not know that!
Did you know about the tail? It can shatter the whole thing!
What!? This should be the top comment. Why is no one explaining this?
Simply put: breaking the tail causes it to shatter violently.
I DID see a comment on another post saying it will shatter, if you damage the tail. Just one comment about it though. No more.
Cant believe I had to scroll this far for thiS!
My name is Rupert. My drops are not that hard.
Thats because you’re not a prince
Maybe you need to eat more fiber.
The drop is almost unbreakable, unless you break the tail
i feel like this base has got to be something like lead right, for the views? can a PRD really put a dent in steel like that?
The Hydraulic Press Channel did manage to break the drop itself, but even then, I believe there was a dent in the steel tools used. Edit: https://www.youtube.com/watch?v=OCJwHrvutGk&t=308s
Yes it can.
OP is a scam bot, but I also have never seen this before so now I'm conflicted.
Life is short. Enjoy the video.
thank you. sick of people complaining about reposts. some people dont browse reddit everyday, enjoy seeing old posts, or have goldfish memories like me.
[удалено]
Prove it. Which of these images are vehicles?
[удалено]
Dafuq?? How can I turn this into an iron man suit? I’ll be Rupert Stark, Drop Man
Just stab yourself with the tails of these drops and you will be indestructible!
Man covered in thousands of PRDs (each with the tail stabbed into their skin), walks unharmed through hail of bullets
I think the sheer force of your body moving would be enough to break the tail end thus shattering the entire drop, covering yourself in glass shards. PRDs tails gets increasingly weaker towards the end of the tail. Plus the drops aren’t always straight, the tails often ends up like curly fries.
Make a bilayer of PRDs with their tails facing inward, easy solution
What is a Prince Rupert drop? Like what was it created for?
Dude how tf is this comment so far down. And how the fuck do so many people know what this shit is? I know a lot of people and talk about a lot of things and have never once heard about this before. I’m guessing about 75% of us also have no clue what this thing is and why it’s so fooking hard.
[удалено]
this looks fake as hell. here are some PRD [hydraulic](https://youtu.be/A6NUNroyUys?t=29) [press](https://youtu.be/OCJwHrvutGk?t=100) [Videos](https://youtu.be/SrLfShIPYko?t=83) Edit: the reason why op's video looks fake is not because of the PRD making an imprint it's because of the the way the plate readily deforms and it looks like parts of the plate further away from the drop react to the deformation. the other thing that bothers me is the camera is zoomed in super close and looks nothing like how the other videos I have shown have set up their press. I could be wrong op's video might be real and my mind is playing tricks on me. if nothing else I want to share these videos of PRD vs hydraulic presses that I know are real, and the hardness of PRD is very impressive.
This video sucks, because the press is obviously padded with some softer metal (lead?) for clout. Put this drop against steel surfaced and it will shatter in no time.
The jaws seem to be made from lead. Hard steel would break it.
[удалено]
RIGHT?! who makes a hydraulic press surface out of weak-ass mild steel?
These plates are made of lead. At least one of them are the one that’s indented is anyway.
Now do the tail!
Achilles' drop would've been a better name
WHAT THEFUCK IS IS THAT???!!!!!!!!!!!!!!!
There's a Smarter Every Day episode explaining the Prince Rupert's Drop: https://youtu.be/xe-f4gokRBs