Bizarre Spinning Glue
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- Опубліковано 18 лис 2020
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PVC cement (it's technically not glue) spins in water. It might be because the solvent is being expelled onto the surface of the water creating jets the propel the blobs around.
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I never knew there was so much chemistry involved in plumbing. More research needed.
“The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka' but 'That's funny. '” - Isaac Asimov
"It's not glue, and that's an important difference"
“I tried to make a solvent, but had mixed results”
The PVC cement is actually a suspension of low molecular weight PVC, these initiate furthrr polymerization on contact with water. This is how PVC is produced industrially. This process is extremely exothermic. I'm guessing the effect is caused by water forming PVC capsules, heating up the trapped solvent water mix until they break (as you speculated) and release a pressurised jet of hot liquid. Perhaps you could test with thermal imaging camera on cement in a small amount of water. Incidentally you weren't able to make your own cement because the PVC pipe is high molecular weight.
Why glue spins like crazy in water
"He spent the rest of the day adding drops of PVC cement to the puddle" I RESPECT THIS MAN
As a chemist in a adhesive maker who play with those cements everyday, I can tell that the main components of PVC cement is PVC, MEK, and cyclohexanone. (or tetrahydrofuran)
Steve, I am a commercial diver. I watched this video and when you talked about dry ice it brought up a memory... when groceries are sent offshore in the gulf of mexico, they are sent with dry ice. There was one occasion where I was in the water on a decompression and they threw the dry ice overboard. Dry ice sinks. But it sunk to a certain point and it stopped sinking. Then it seemed to hover mid water. I watched this phenomena for several minutes. I cannot remember my depth but I want to say it was shallower than 100', well within scuba range. It was awesome. I watched it come down off gassing the whole way and then just stop and off gassed until there was nothing left, and then another chunk was thrown overboard and did the same thing. I just found out about your channel and I am impressed. Maybe you can do something with this.
"and he spent the rest of the day playing with drops of PVC cement in the puddle"
I love how some of these videos don’t really give a satisfying answer. This is how real science works and it’s super interesting how much there still is to learn about the simplest things.
Very interesting video. Perhaps you may have given up on the surface tension theory a bit prematurely. I found that one droplet of liquid dish soap causes the PVC cement globs to stop moving immediately. This argues against the "driving force" arising entirely from the momentum of jets being expelled from inside the globs. Perhaps small amounts of solvent leach out (as you suggested) and cause fluctuations in the local surface tension. These fluctuations in surface tension may lead to the chaotic movement. The dish soap would lower the surface tension uniformly, thus abolishing any heterogeneity. We'll have to do more tinkering to sort this one out.
PVC cement is highly intelligent, but severely lacks arms to get out of a potential drowning situation.
5:40
Looks like microorganisms moving on the microscope
Me: "I moved the light round a bit and I could see better."
That happened with a dead insect recently with here.
Outcome of the video: It's much harder selling a VPN since the Tom Scott video...
Now I’m just waiting for someone to do a master’s thesis on this
Hey I just want to say "thank you."