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arthur_affect's profile
Arthur Chu
Arthur Chu
Arthur Chu
Verified account
@arthur_affect

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Arthur ChuVerified account

@arthur_affect

Mad genius, comedian, actor, and freelance voiceover artist broadcasting from the distant shores of Lake Erie (he/him)

Broadview Heights, Ohio
arthur-chu.com
Joined August 2009

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    1. Sophia Gad-Nasr‏Verified account @Astropartigirl 10 Jul 2020

      If you touch two CLEAN blocks of the same metal together in space, they weld! Atoms in solid metals move a bit. Touch two clean surfaces together, and the atoms can't tell they're in different blocks so they become one group of atoms, ie ONE SOLID. (Gif: https://www.homemadetools.net/forum/cold-welding-gif-56268 …)pic.twitter.com/WAfv3VwhnX

      439 replies 5,734 retweets 19,813 likes
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    2. Sophia Gad-Nasr‏Verified account @Astropartigirl 10 Jul 2020

      The reason it doesn't happen on Earth when you put two of the same metals together is because of oxygen, which causes metal to rust. That oxide layer sits the two metal surfaces, so atoms in each block see a layer of different atoms, and know that's their "limit" for movement.

      42 replies 213 retweets 2,332 likes
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    3. λογγος 🧠 👀 💥 🌌 🍑 🍧‏ @logGo13 10 Jul 2020
      Replying to @Astropartigirl

      Why does this not work with, for example, gold on earth then?

      1 reply 0 retweets 0 likes
    4. Niko Komin‏ @kokemikal 10 Jul 2020
      Replying to @logGo13 @Astropartigirl

      Was wondering, too. In the video they use gold nano wires and write in the paper: "The good resistance to oxidization of gold is another useful property." So I guess it could happen. But maybe it oxidizes just enough to prevent it happening outside labs.https://www.nature.com/articles/nnano.2010.4 …

      1 reply 1 retweet 1 like
    5. Arthur Chu‏Verified account @arthur_affect 11 Jul 2020
      Replying to @kokemikal @logGo13 @Astropartigirl

      It can be done with gold within the Earth's atmosphere, if you polish the surfaces first and push them together hardhttps://www.youtube.com/watch?v=mHAhfX7iRjs …

      1 reply 1 retweet 5 likes
      Arthur Chu‏Verified account @arthur_affect 11 Jul 2020
      Replying to @arthur_affect @kokemikal and

      All of this stuff is on a spectrum, too -- like if you have two clean smooth surfaces of just regular stainless steel, the oxidation layer won't prevent it from cold-welding in atmosphere if you put it under enough pressure

      1:52 AM - 11 Jul 2020
      • 1 Retweet
      • 3 Likes
      • preetam λογγος🧠👀💥🌌🍑🍧 Melissa Meadows, Amber, and Alice
      1 reply 1 retweet 3 likes
        1. Arthur Chu‏Verified account @arthur_affect 11 Jul 2020
          Replying to @arthur_affect @kokemikal and

          Like when metal under pressure sticks to itself but not to the degree of true "cold-welding" it's called "galling" and is a significant problem for engineers

          0 replies 1 retweet 3 likes
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