Summer of Math Exposition

Presented by 3Blue1Brown 3blue1brown

From Magnets to Meltponds

Audience:

Tags: physics-ii

A nice little video showcasing how the Ising Model (which was originally used for studying magnets) can be used to model melt ponds.


Analytics

6.99 Overall score*
25 Rank
11 Votes
7 Comments

Comments

6.3

I liked this video. It didn’t blow me away, but it was solid, and the explanations were good. I was able to understand pretty much everything, and I think the target audience would also be able to understand most, if not all, of what was discussed. I think the weakest part of the video is that it wasn’t terribly exciting. I don’t expect the presentation to be full of whiz bang stuff, but it was a little “blah” and I worry a bit that the target audience’s attention might wander somewhat.

8.4

This video is very to the point and talks about exactly what it wants to talk about. The parts where the values were given were a little fast because I needed to rewind just to check my intuition, but that is about the only thing I could fault about the video. Great video and cute art style

7

Deeper explaination of the Hamiltonian

7

Definitely. I would be curious to see more quantitative visuals for the similarity of meltponds and Ising models; e.g. the structure function, correlation length, etc.

3

The visuals in the video are excellent, but the initial explanation of the Ising model could be much clearer. For example, why do we drop the long-range interactions? What do positive and negative values of J mean physically? These points are not addressed. Later on, from the middle to the end, the discussion shows some evidence of similarity between melt ponds and ferromagnets, but it feels rushed and lacks careful attention to detail.

7.5

Great video, I especially liked the use of a non-standard font which helped make it feel unique. My only reasons to deduce points are novelty and memorability: There are countless ressources on the Ising model, and this transfer to a new system felt a bit underwhelming since the end result is “just the same”. Maybe this could be alleviated by changing the structure: Though you explained how the finished model works, it might have been more instructive to rederive it, which could have made the viewer a moe active participant and made it more memorable. Nevertheless, this is good work!

6.1

Great video! The breakdown of the Hamiltonian for the Ising model was very clear, and the visualizations went perfectly with the math. And, for such a niche topic (the modeling of melt ponds), I think you did an excellent job of connecting it to something that the model is more commonly used for (magnetism). The pictures especially were very vivid.

One thing I do wish was touched upon though was how exactly the simulation is updated. It seems that the energy was being minimized with time, and I am curious: were random changes implemented, and kept only if the energy went down? Was there some sort of gradient descent/laplacian smoothing going on to minimize the energy? Though I can understand if excluding this for reasons of conciseness was a conscious choice. Anyway, the topic was very interesting and I might have even been inspired to try to program something like this in the future :)