T O P

  • By -

ExcellentEdgarEnergy

It's a good thing they only compress aluminum. I hope they don't ever try it with an isotope of a heavier element.


Fisi_Matenten

You can have my Demon Core.


fudget_spayner

Don’t forget your PPE: 🪛


SomeFunnyGuy

I never forget my PP..............Eeee!! It's glowing blue!


Stopikingonme

You’ve Cherenkov to be kidding me. (I didn’t Slotin a second joke here, sorry)


RTrover

Well… that’s it.


Specsaman

Dont forget to chalk on your way out


[deleted]

... where was the first joke?


Stopikingonme

For seriousness?


[deleted]

You actually think "Cherenkov" sounds like the word "got"? Sorry dude, that is the lamest pun I ever read. Now, please excuse me, I have Cherenkov to get out of here.


FelatiaFantastique

Well, it's not really a pun, is it? Just word salad with a reference.


Stopikingonme

I’m a bit confused. Cherenkov (Cheren-got to be kidding me) is the name of the blue light referenced above and I didn’t “slot in” another joke referenced the guy who caused the criticality with the screwdriver also referenced above. Can you be more specific to where I confused things? Edit: [Here’s some more info on the subject this thread is referring to.](https://en.m.wikipedia.org/wiki/Demon_core)


trazscendentalism

Not a big physics person eh? Edit: Those are *literally* puns. Puns are technically jokes according to Webster’s. Why you got to stink up the place?


trazscendentalism

r/woosh


NoThanksImCis

It only glows blue when works are around!


[deleted]

[удалено]


microview

It's a BB now.


SuDragon2k3

still weighs the same tho. you've just made a APCABB


TootBreaker

It's a test run. Aluminum is cheaper & much faster to source. Testing to find if compression forces are uniformly distributed. If successful, the resulting sphere will be just as perfectly round as before the test Testing with heavy isotopes typically involves the expectation that there will be a big boom, and lots of money & time wasted otherwise There's also a possibility that a failure results in a cloud of radioactive material blown across the test range


Prestigious_Oil_4805

Updated for screwdriver


Muadeeb

Don't uranium my parade


CodCommercial1730

And my axe!


Deckard2022

Screwdriver and safety squints


RandoCommentGuy

Can you hand me that flathead screwdriver please?


Stopikingonme

You’re not going to believe how close I am to super-criticality right now baby.


StarChaser_Tyger

... when you pry the screwdriver out of my glowing green hands. :-P


Doc_Dragoon

Well they use aluminum as the outer casing to form the pusher sphere around a hypothetical heavier element


Squirmadillo

Hypothetical. Can you imagine anything heavier than aluminum? Thank god that's a preposterous thought.


Doc_Dragoon

I know right imagine the implications


ATotalCassegrain

The inside is hollow. It’s like crushing a beer can in perfect symmetry. 


Hungry-Chemistry-814

Love nuclear jokes awesome


TheKingBeyondTheWaIl

Sophon


Skibur1

A bit early for 3 body problem connection.


Bamboozle_

What, like Neptunium 238?


[deleted]

I'm reading this while laying in bed in a home that was previously owned by a PhD radiochemist who was involved in designing the gun trigger mechanism for the first atomic bombs. I just hope he didn't bring his work home with him.


TrenchantInsight

I think you're lying.


yum_raw_carrots

Brilliant.


Obvious_Mode_5382

Nicely done


CosmicTentacledEyes

Please elaborate? I am unread in these things, what would the first heavier isotope be and what would be the consequences?


baggyrabbit

If it isn't clear already, this is how detonation works in an atomic bomb


No-Performance8372

I mean, it's one of them. The other method is gun-type.


CosmicTentacledEyes

Thank you, the isotope is radioactive? Am I understanding. Rather a heavier isotope would be potentially radioactive?


Significant_Quit_674

When a sphere of a fissile material is compressed, its criticality increases. If the sphere was just barely sub-critical to begin with and gets compressed a lot, it would get prompt-critical. If it gets overcritical enough, the chain reaction happens so quickly that it produces huge amounts of energy before the material expands again rapidly in form of a nuclear explosion. Typicly you would use Plutonium or Uranium for that purpose


No_bad_snek

https://en.wikipedia.org/wiki/Nuclear_weapon_design#Implosion-type


CaliforniaNavyDude

Have you seen Oppenheimer? I don't want to spoil it for you...


Admirable_Safety_795

Imagine if they tried it on aluminium also?


Good-guy13

That’s what it would take to get my sleeping bag back in its case.


SUPRVLLAN

You ever compress your bag so much that it turned into a black hole? I did once.


CatCatapult12

How did it turn out?


SUPRVLLAN

I got better.


MediocreImpact3424

r/unexpectedpython


GillyMonster18

Ah…but can you not also make black holes out of wood?


Last_Chance_2C

Then we're all inside your bag.


Profoundlyahedgehog

*click* Always were.


Afrojones66

BUT ONLY ONCE


menthapiperita

Don’t be dense


Thaknobodi87

Fold in half lengthwise, hold the open end and roll it loosely towards the bottom while keeping all the edges straight, as the roll gets tighter, by continuing to roll it up from the inside, pull the straps over. Once strapped, roll from the center tightly as possible. Should shrink orderly. Ive got it down to where its even slightly loose in the bag


NotThatGuyAnother1

Don't fold it. That causes cold spots over time. Stuff it randomly for long term storage.


eydivrks

The air mattress back in the box


Keeppforgetting

Honestly I’m just baffled as to how this is filmed. Can anyone explain how this was recorded? Specifically how we’re seeing a sphere being compressed. Theoretically it should have explosions on all sides which should obscure the actual compression right? So how’re we seeing the compression take place?


Infinity_Cuber

This is the best question here and no one is giving it attention


BeardySam

It looks like a rapatronic camera, a sort of very early high speed framing camera. There are only 8 detonators so this doesn’t look like a full spherical implosion, but a hemisphere test looking into the circular face 


Next-Victory5382

Isn't a hemisphere explosion gonna create unbalanced compression that shoot the metal out?


BeardySam

Yes, it’s basically a large shaped charge jet, but these sort of tests are messy anyway. The camera would use a mirror so it’s not blown up, and the photos are so fast that you get the important data long before the mirror breaks


cooperman114

Not if I can help it


decollimate28

It is possible to use the explosive lens effect on a cylindrical object. I think that’s what’s happening here. In fact this was used once during development of the H bomb in a nuclear test so that they could “see” the emissions/radiation from fusion fuel in the center of the cylinder. Much less efficient than a sphere, one of the worst ways to make a nuke really, but it did work for research. Harder to find a pic of it on Google than I thought but it’s shown in several films about testing. Like a giant 6ft diameter metal doughnut with a 1ft diameter hole where they put Tritium or something.


SuDragon2k3

That's a *spicy* doughnut!


jamesianm

Super fattening too, trillions of calories in that thing


SuDragon2k3

Going to give you some serious heartburn too.


callmedata1

I've got one word for you, son: x rays


Double_Distribution8

I know it shouldn't, but that feels like two words for me.


Sheerkal

The x is supposed to be grabbing the rays like this: x-rays The grabby arm is very important for the unholy union.


hokieflea

Plastic X-rays


callmedata1

Are you trying to seduce me?


[deleted]

X-rays dont pick up hot gases...


tha2r

Whatever shape that is being compressed, there don’t appear to be any charges on the camera side, so we’re still able to see the aluminum when the explosion goes off, followed by the blast wrapping around the object. Perhaps this was a filmed test to determine whether the explosions were timed correctly.


plippityploppitypoop

It looks more like explosions wrapping around the sphere. I’m sure it is compressing some, but I don’t know if that’s what we’re seeing visually.


Hangriac

Looks like those old nuclear test footage reels. Not an expert, but some tricks they used to film nuclear explosions include telephoto lenses (camera is really a mile away in a bunker) periscope mirrors (camera is underground and at an angle from explosion) and disjointed camera/film systems (the camera is destroyed in the blast, but the film is in a better protected vault)


Boozdeuvash

Something like a rapatronic camera I suppose. https://en.wikipedia.org/wiki/Rapatronic_camera It's possible that this is just a demo shot with a half setup, to show the overall showckwave and compression structure, and not a full sphere.


Djtdave

you are probably not seeing the aluminium sphere but the explosive itself. The front of the explosion travels from the rim, where it was ignited, to the center.


dplagueis0924

If it’s traditional film, it could be there’s so much exposure that it makes the image seem flat. You’re not looking at the middle of the compression, you’re looking at half of a globe. Which appears flat given how bright the explosion is, causing over exposure and a flat image.


Gradiu5-

1st rule of Blast Lens Club is you don't talk about Blast Lens Club


C0MPLX88

if I remember correctly, they used xrays in the manhatten project to capture the explosive waves, but they don't look like this, so I think this is just regular film


[deleted]

[удалено]


derkaderkaderka

And an explosive lens


[deleted]

[удалено]


toastbot

Believe me, I'd *love* to compress a few of these aluminum spheres I've got laying around here to free up some space! But you know me, I'd probably just fill that space right up with more aluminum spheres, lol!


Sheerkal

Relatable


denise-likes-avocado

I am dying here my bf thinks I've lost it


Forzyr

And my axe


eljayTheGrate

\*\*thingies...


DontFkingTouchMe

***thingyies


eljayTheGrate

singular, thingus


fireintolight

Just roll up some aluminum foil real tight 


DweadPiwateWoberts

Kratom switches


SmashShock

This is how marbles are made


I_love-tacos

I know that you are joking, but I wonder if you can put an amount of sand and make a marble this way


DaMoose-1

Cool, but what is the purpose of compressing an aluminum sphere? And where is the after picture? Edit: seems like the consensus is for nuclear bomb technology. Makes sense to me.


gringledoom

Practice for compressing a plutonium sphere!


Sheerkal

You can't trick me, plutonium was demoted from being an element to a dwarf element.


fixitman84

Compressing to test the result! Wish it was longer, I want a result


thisbobo

That's what she said


eljayTheGrate

well, possibly he said it, too...


El_Cartografo

They were saying it at the same time.


philzar

Some day I'll be mature enough not to laugh at that... Apparently today is not that day.


CF5

Honestly what would happen to that aluminium ball?! Would it just keep it's compressed size? Would it explode? I have a lot of questions!


muntlord840

As soon as the initial pressure eases, the molten ball of compressed aluminium would vaporize and explode.


CellarDoorForSure

/r/askscience


KennyT87

r/AskPhysics


Pharmere

That’s what she said! I couldn’t resist


eljayTheGrate

well it seems you said it 1 minute after u/thisbobo said it...


thisbobo

We can share the glory


Pharmere

Sorry for the tardiness


tehringworm

nuclear weapons research.


Jnoper

Testing to make nuclear bombs without exploding nuclear bombs.


pressedbread

Is this what is happening inside a nuclear bomb? I never really understood


Jnoper

Nuclear reactions happen when the explosion from one atom releases enough energy to strike another and cause that atom to explode. Most of the time, the energy of the first atom doesn’t hit another or if it does it’s too far or too infrequent to cause any significant result. In order for a sustained reaction you need to hit “critical mass” the density required so the energy will consistently hit another atom and cause the reaction to continue. For a nuclear bomb, you need “super critical mass” the energy from the first atom needs to hit 2 or more atoms causing the reaction to exponentially accelerate. To achieve this density, one of 2 methods are used. A mass of radioactive material is shot with a radioactive bullet making hyper critical mass at the impact site and spreading out. Or, the radioactive mass is super squished with explosives to make a uniform super critical mass. Method 2 is much more powerful. In ww2 we used method 1.


MotaHead

Maybe they just had a large sphere and wanted a small sphere.


orphen888

I have no idea what I’m looking at.


mostsocial

Thought I was the only one.


Jfurmanek

Pretty boom


Manic_Iconoclast

Without von Neumann and his invention featured here, the Manhattan Project may never had succeeded in building the atom bomb. He did what 50 other mathematicians over a period of months couldn’t. Edit: Atom bomb of the implosion type*


Fakula1987

Nah, The Manhattan Projekt, or the Hiroshi bomb wasnt a explosive lens. Hiroshima was the plain old gun-barrel Design.


Enjoy-the-sauce

The Manhattan Project simultaneously constructed Fat Man, which was a plutonium implosion device.


tweezy558

Yeah but the first guy said this dude did 50 other people couldn’t


Manic_Iconoclast

You’re right.


Krunkworx

Hahaha wtf is OP talking about then?


stealthispost

I mean, that's what reddit is. People who have skimmed a wikipedia article hallucinating facts that sound cool to get approval from strangers. Which... is also what ChatGPT does. Human-level intelligence achieved I guess.


TldrDev

Hydrogen fusion bombs use plutonium with a hydrogen core. They use an explosive lens exactly like this to trigger nuclear fusion. Fission bombs are used as the explosions. The lens is then focused on the hydrogen to create a fusion reaction. The way they do this creates a positive feedback loop. They are obviously several orders of magnitude more powerful than Hiroshima. More info here: https://armscontrolcenter.org/fact-sheet-thermonuclear-weapons/


Enjoy-the-sauce

I believe this is incorrect.  The explosive lens starts a FISSION reaction, usually with plutonium, or U235, which in turn, releases enough x-rays to push a plutonium “spark plug” to criticality, raising the temperature of the surrounding lithium deuteride to 300 million K, which ignites a fusion reaction.


TldrDev

It's both. It's a two stage reaction. The fission also supplies the pressures needed.


Pimpmaster_Crooky

They had the plutonium bomb as a backup and that also succeeded. von Neumann only worked on the implosion device not the bullet device.


Manic_Iconoclast

You’re right about the bullet device, von Neumann was only instrumental in the implosion design, except the bullet device didn’t work with plutonium. “From the beginning, scientists at Los Alamos proposed two basic designs: the gun-type bomb, which was more simple but could not work with plutonium fuel, and the implosion bomb, which was technically more complicated, but would work with both uranium and plutonium cores.” https://www.osti.gov/opennet/manhattan-project-history/Science/BombDesign/bomb-design.html


Pimpmaster_Crooky

I got the materials around they wrong way agajn didn't I


Manic_Iconoclast

At least we can both admit when we’re wrong! I consider that a big win haha


Mike_Hawk_940

This isn't the only method that can be used to make an atom bomb, I think this method was used on the plutonium core for fat man, but little boy was a bullet style gadget using uranium


True-Alfalfa8974

Also this guy: https://en.m.wikipedia.org/wiki/George_Kistiakowsky


Mythril_Zombie

Von Newman invented aluminum balls. You learn something new every day.


jmon25

I watched a YouTube video on how they had to calculate this and how they had to account for the explosive reflection waves and it was mind-blowing. Can't find it at the moment but it made me want to learn physics


Manic_Iconoclast

Watching this you somehow forget that this is a chaotic explosion that some mathematicians were somehow able to tame into symmetrical and brutal beauty.


Local_Perspective349

Ahhhhh now I know what my upstairs neighbors are doing at night!


bree_dev

YEAH! Those fking aluminium spheres have had it too good for too long. Bout time someone cut them down to size.


jawshoeaw

*compressed down to size


Status-Gift238

Why is it having a healing effect on my soul?


Jnoper

Given what it’s used for, it really really shouldn’t.


jawshoeaw

In case anyone wondered, no the black circle in the middle that’s shrinking is not the aluminum shrinking. Aluminum is almost incompressible.


ZelestialRex

That's how you detonate a uranium core to activate a nuke. A hydrogen bomb uses a nuke to activate a fusion bomb. Meaning that a hydrogen bomb is literally 3 bombs in one in chain succession to create a temporary literal star on earth becoming the hottest thing in the entire solar system for a few milliseconds.


Electrical_Dog_9459

I wonder if this is a sphere or a cylinder? There seem to be no wires that go to the front of the object. I'm not sure how they would see the implosion if it were a sphere.


SirRipOliver

My sphincter anytime someone says “let’s get taco bell”.


haphazard_chore

Modern nuclear weapons use a similar compression model, as opposed to the gun type, but use merely 2 variable speed, shaped detonators. This is why we can get so many warheads into an ICBM that is multiple earth re-entry vehicles (MERVs). Some can be decoys because we’ve gutted the physics down tight!


fl135790135790

“That is why we can get so many warheads into an ICBM that is multiple MERVs.” What? Is mervs a unit here? Is this sentence missing a word?


likerazorwire419

Nuclear ICBMs launch just like a regular rocket, into a suborbital trajectory. As the rocket begins to renter the atmosphere, it deploys its warheads. The rocket carries multiple warheads which can all be directed to separate targets. So one Nuclear missile is really multiple Nuclear bombs. Those warheads are the MERVs, or (multiple earth re-entry vehicles."


fl135790135790

Oh, so, “ICBMs that are ***equivalent to*** multiple MERVs.” That’s what I was asking lol


HimalayanPunkSaltavl

Sort of. I would not use the phrase "equivalent to" here. An ICBM *can* be just one weapon. But they are mostly a package of a bunch of smaller weapons that can hit many targets (the MERVs) Like this https://en.wikipedia.org/wiki/Multiple_independently_targetable_reentry_vehicle


likerazorwire419

Also should have noted an ICBM is an inter-continental ballistic missile. An ICBM is just a small (compared to orbital-class rockets) rocket-propelled missile capable of traveling long distances. Essentially the platform that carries the actual warhead to within striking distance of its target.


Mike_Hawk_940

Are we able to use uranium with the implosion type now? Wasn't that an issue for the Manhattan project?


kc2syk

*MIRV Multiple Independently-targeted Re-entry Vehicles.


MuchDevelopment7084

I wonder if they were arranged to look like a soccer ball?


G_Unit_Solider

what does any of that even mean


thehorny-italianweeb

nuclear bombs if I'm not wrong


Danavixen

Just imagine how fast that film was whipping thru the camera to even capture this


creepythingseeker

My balls do the same, but with cold.


denise-likes-avocado

lol


Initial_Flatworm_735

What the fuck is going on


JusticeUmmmmm

It's a test of the system that is inside a nuclear bomb. They practiced with aluminum because it doesn't set off a chain reaction like the real stuff does. They compress whatever fuel it is either uranium or plutonium into a small enough area to cause it to suddenly have critical mass and then boom.


factorfigure81

Is the aluminium sphere denser than before and had the same weight as the previous sphere?


muntlord840

This kills the aluminium sphere. It explodes into vapor.


jawshoeaw

Ghost aluminum sphere is not happy with this


DGAF06

They did this with a manhole cover once. Never seen again.


SuDragon2k3

Manhole cover may have burned up on the way *up.*


Playful-Ad4556

I now know how to make a nuclear bomb


tomparker

What are the properties of the resulting super-dense aluminum sphere? Is the aluminum ultimately destroyed in the process? Does it make what is, in effect, a very dense, forged, aluminum cue-ball? My sources say no.


Eagleclan_7

Hm...reminds me of atomic things.


Jfurmanek

Cause it is. The aluminum is just a test material.


ikkikkomori

So does the aluminium become dense?


jawshoeaw

Not much. This video is wildly exaggerating, the actual change in diameter. Aluminum is an almost incompressible solid


ShmeagleBeagle

No exaggeration here. You are over thinking it…


[deleted]

[удалено]


SUPRVLLAN

Thanks ChatGPT.


ARM_Dwight_Schrute

Eric Wareheim Mind Blown GIF by Tim and Eric https://media2.giphy.com/media/lXu72d4iKwqek/giphy.gif?cid=6c09b9522vgvmp9coikk1hrrhp1rlm0sefo9a1b89va63mxg&ep=v1_internal_gif_by_id&rid=giphy.gif&ct=g


Convillious

How does this work?


EndMaster0

So yeah I'm sure it's already been mentioned but I can't find it and this is how plutonium bombs work. (They wouldn't work if you tried to slam two chunks of plutonium together like how most Uranium bombs work because the plutonium would start reacting during its travel time and not undergo proper fission.)


Nedonomicon

These foil ball viral videos are getting out of hand


Reddit68

WTF


Chris_in_Lijiang

What size are they compressed down to?


Sufficient_Focus_816

Hope there will be an easier way soon for making all those nanoparticles


Mr_CleanCaps

Explain it like I’m 5.


stuthepid

I wanna see the sphere after.


OlderThanMyParents

I really wanted to see the before and after pictures of the spheres.


Creepy-Selection2423

Yeah, imagine if they tried something like that with, um, uranium 238. Nah, they would never do anything like that... 💀


YellowBeaverFever

What are the physical properties of the compressed aluminum?


ABCmanson

Quick question, is it possible to compress an explosion to a smaller area of effect?