My bicycle was simply sitting at rest indoors when it exploded. A slit about ~6mm long was in the tube. I thought it might be too big to patch, but I happen to have some quit big patches to try. I cleaned the area w/denatured alcohol then roughened the surface w/the sanding tool. I covered the whole patch footprint area with rubber cement. Around 90 sec. later applied the patch and lightly clamped it down. About 5 min later: installed the tube and inflated to 4.5 bar.
This weekend I did some experiments with turmeric powder. Here are some images of the results, and the description of how to create these microscopic chemical landscapes is given below.
I acquired a ~16 year old laptop. The mat black plastic top (back of the LCD) is sticky. At first I thought the previous owner had stickers on the back that were removed. But that seems like a bad theory now. I rubbed it with a cloth and denatured alcohol and it only got slightly less sticky, but black residue came off on my hands and the cloth. This is apparently not adhesive.. it’s the plastic itself.
In the heart of World War II, as the Nazis took control of Copenhagen, a peculiar situation took place at the Institute of Theoretical Physics, led by physicist Niels Bohr. Two Nobel laureates Max von Laue and James Franck, fearing the confiscation of their gold Nobel Prize medals by the Nazis, had sent their medals to Bohr for safekeeping.
Making liquid nitrogen is quite an achievement, especially using salvaged air conditioner and refrigerator parts. A nice application of the Joule-Thomson effect and countercurrent exchange too.
Not very practical, but the chemistry is interesting. Producing a strong acid from a weak acid by using precipitation as the driving force is something I don't see very often.
The manual for my dishwasher says to refill salt just before running a wash cycle, because if any grains of salt spill onto the stainless steel interior it will corrode. If it runs right away, no issue because the salt is quickly dissolved, diluted, and flushed.
There are a few youtube videos where someone suggests using sulfuric acid to clean a secondary plate-style heat exchanger (for example). Yet I’ve heard sulfuric acid is extremely corrosive to metal, so something seems off about that advice. I certainly would not want an internal leak to cause radiator fluid to enter the tap water. I saw a drop of sulfuric acid land on a galvanized steel pipe once and within minutes it was rusted on the spot.
A top-floor room that’s not currently used has mold from excessive dampness. For a month I have been running a dehumidifier as it’s too cold to open the window.
I have a hot water dispenser, which heats the water to the temp you specify, on-the-fly. Sometimes this technology is called “insti-heat”. Instead of filling a kettle and waiting, it pumps water from a tank and heats it inline as fast as it draws it. Likely similar to how Nespresso machines work.
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