Today we're waiting for an IKEA delivery that, according to their email, will be a 10x10x10 cm box weighing 14 kg.

So density-wise that has to contain berkelium, californium, protactinium, tantalum, uranium, gold, tungsten, plutonium, neptunium, rhenium, platinum, iridium, or osmium.

We're of course hoping for platinum, and really not for plutonium, because the critical mass is 11 kg...

@Zarkonnen well that's exciting. I also hope it is not plutonium.
@Zarkonnen Love that you went to the time to work this out :D
@Zarkonnen Does it have to be an element?
@mansr @Zarkonnen probably not but ionic salts of those elements that are dense enough would likely not be dense enough because of the nature of how bonds create space and make compounds overall lower density than pure elements. Alloys combining some of the elements might be in the density range, maybe? Offhand that's my answer but I never took inorganic chemistry

@coreo @mansr @Zarkonnen

It doesn’t have to be an element. Tungsten carbide has a density of 15.6 g/cc

@mansr @Zarkonnen Also it could be an alloy of some of those elements.
@Zarkonnen If it's plutonium, I don't think the delivery is going to arrive.
@mhkohne @Zarkonnen It could, if it is split in two parts with a neutron catcher in between. Don’t know whether the available space is sufficient for that though.
@WPalant @mhkohne @Zarkonnen Since it's IKEA, it comes with set of drawings explaining how to assemble the two halves
@Sven @fgrosshans @mhkohne @Zarkonnen As usual: bullshit generator (a.k.a. “AI”) produces bullshit. This drawing makes not sense whatsoever. It may be somewhat inspired by nuclear reactor design, but…
@WPalant @Sven @fgrosshans @mhkohne @Zarkonnen using a bullshit generator to help generate shitposts and cheap silly jokes sounds spot on

@WPalant An alloy of Plutonium and Boron maybe?

@mhkohne @Zarkonnen

@mhkohne @Zarkonnen that's exactly what happened. They sent out a blahaj instead to apologize for not delivering. I'd look up where it was packaged and update my avoid list on the nav app.
@Zarkonnen Perhaps it's a tiny black hole (Schwarzschild radius is ~2x10^-23 mm) and the rest is padding?
@chrisg
That's no padding, it's some serious space-time folding to enable transportation of an singularity at all. 0.0
@Zarkonnen
@gom @chrisg @Zarkonnen just surround it with enough books and let l-space do the rest.
@chrisg @Zarkonnen I have found frame dragging makes packaging a black hole difficult.
@kastope @Zarkonnen For a small additional fee you can get the non spinning black hole version, for your packaging convenience.
@chrisg @kastope @Zarkonnen hawking radiation from one that size might be an issue...
@chrisg @Zarkonnen non spinning black holes aren't good for my use case. I'm trying to spin up a naked singularity by colliding smaller ones with the same spin.

@Zarkonnen

"Your package could not be delivered, because the warehouse center has been obliterated by a fission fireball. Click [here] to request redelivery."

@Zarkonnen I am now imagining demon cores sitting on Ikea shelves...
@Zarkonnen Are you sure you didn’t order Ikea’s MÖRKMATERIA?

@Zarkonnen @leyrer well… at least we don't require you to keep us updated

we will hear about it if it was plutonium!

@Zarkonnen Could be some fun refractory ceramic like TaC, or Ta4Hf1C5.

@Zarkonnen 14 Kg of gold would be okay, too.

What dimensions and weight are listed in the product description?

@Zarkonnen on the other hand Plutonium would explain why it didn't arrive yet...
@Zarkonnen Maybe they're just bad at units?
@Zarkonnen It's more likely hopium, which is known to be very dense.
@dan613 @Zarkonnen Depending on the type of Pu, it may just be on fire... long before it gets to you.

@Zarkonnen I was curious so I had to look this one up...apparently Pu-239 has a critical mass of 10 kg and a sphere diameter of 9.9 cm. So its too light. A cube of the stuff would be ~19.1 kg. So unless it is a lumpy sphere, you are fine.

The other elements are left as an exercise to the reader.

@Zarkonnen plutonium sheets with some neutron-absorbing spacers to keep it calm would be pretty neat!
@Zarkonnen @sanguish The box obviously contains Stonehenge.
@Zarkonnen
IKEA MDF is seriously heavy.

@pthane Would that still count as *medium* dense then?

@Zarkonnen

@wonka
Probably have to. Has anyone ever seen HDF? I used to see plenty of LDF used for pinboards or temporary partitions but never encountered HDF. I imagine it would be too heavy to have much practical use.
@Zarkonnen

@Zarkonnen

1) this is hilarious

2) on my first read I read "10x10x10 cm box containing 1 dog" because my eyes decided 14 kg could be seen as 1 dog? dunno.

@Zarkonnen Only once I encounter something of that density; it was a handbag. At some point in time, but then it became critical and might have started a black hole or so....
@Zarkonnen under high enough pressure, you can temporarily increase the density of solids!!
@Zarkonnen Gold actually is the more expensive one by weight currently. Were it volume only, I’d also hope for platinum.
@Zarkonnen if its two half spheres you need to jam the little Allen key in between them.
@Zarkonnen it’s the instructions. Have you seen how dense those are?
@Zarkonnen If I they did invent something like a small TARDIS, just think of how many Blåhaj they could stuff into something 1000 cm^3 🤔