this post was submitted on 15 Jul 2025
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xkcd #3115: Unsolved Physics Problems

Title text:

'Tin pest' makes more sense to me. Tin just doesn't want to be locked down in a shape like that. I get it. But why would any metal want to grow hair??

Transcript:

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Source: https://xkcd.com/3115/

explainxkcd for #3115

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[–] Successful_Try543@feddit.org 58 points 3 days ago (2 children)

A colleague of me did his PhD exactly on the last topic.

[–] BartyDeCanter@lemmy.sdf.org 41 points 3 days ago (1 children)

And does he know why? I've had to deal with it too often and it would be really nice to be able to expand RoHS to aerospace.

[–] Successful_Try543@feddit.org 66 points 3 days ago (1 children)

Deep in the coating, where the Cu6Sn5 [Remark: intermetallic phase of Sn coating and Cu substrate] is present, the deviatoric strain was high. This indicates that the growth of the intermetallic phase causes plastic deformation of the tin coating.
[...]
A short (4 micrometre) radial gradient in hydrostatic stress was observed around the root of the whisker. This gradient together with long-range diffusion from specific regions could provide the driving force for whisker growth.

https://portal.research.lu.se/en/publications/tin-whiskers-experiments-and-modelling

[–] Lemminary@lemmy.world 3 points 1 day ago

Oh, but of course! The deviatoric strain, yes.

[–] cmgvd3lw@discuss.tchncs.de 18 points 3 days ago (3 children)

Did he found a cure for baldness?

[–] Successful_Try543@feddit.org 28 points 3 days ago (1 children)

Well, if you are willing to coat your head with copper and some tin on top, you can grow yourself some tin whiskers. Yet, I don't know if they make a good replacement for hair.

[–] mojofrododojo@lemmy.world 2 points 2 days ago

shaving is gonna be an adventure

[–] elucubra@sopuli.xyz 2 points 2 days ago (1 children)

There is no cure for baldness, else Bezos would have a mane.

[–] markovs_gun@lemmy.world 2 points 2 days ago (1 children)

Elon has hair plugs that admittedly look pretty good. I think Bezoa just lost his hair too quickly to fool anyone.

[–] bstix@feddit.dk 2 points 1 day ago (1 children)

hair plugs that admittedly look pretty good.

Nah, it also doesn't fool anyone. it looks like a toupee, except that he can't take it off.

[–] morphballganon@lemmy.world 2 points 1 day ago

It looks better than his natural hair did

[–] Honytawk 8 points 3 days ago

No, but those zinc ingots now have great mustaches!