chemistry   15147

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Elise Hunchuck en Instagram: “An account of Iceland, an account of Berlin: hardness of water is the amount of calcium and magnesium in the water and is measured in units…”
"An account of Iceland, an account of Berlin: hardness of water is the amount of calcium and magnesium in the water and is measured in units of German hardness [°1dH, where 1dH = (Calcium (mg / l) x2, 497 + Magnesium (mg / l) x4, 116) / 17.9]. The scale runs from 0 and 4°dh (very soft) to 8 to 12° dh (hard) to very hard at greater than 30°dh. The water here in Berlin ranges from 14 to 25 °dH (pretty hard to hard). It is the reason that many people complain about calcified deposits anywhere water flows – from sinks to toilets to showers to espresso machines to our skin and to our hair. You might not notice it as first, but after a while, the deposits make their mark, changing composition and appearance everywhere they’re left. After spending a few weeks out of the country, and some time in Iceland, where the water’s hardness is less than 2, and in the Reykjavik area it is particularly soft between 0.2 and 0.6°dh, I noticed the difference in my skin and, especially, my hair. I washed it and let it dry, on its own, and it finally responded, unencumbered (for the first time in almost two years) by the minerals – that particular heaviness – of Berlin.

A small thing, you might think, until you recall, for example, as Heather Davis so eloquently wrote, “we become the outside through our breath, our food, and our porous skin. We are composed of what surrounds us. We have come into existence with and because of so many others, from carbon to microbes to dogs. And all these creatures and rocks and air molecules and water all exist together, with each other, for each other. To be a human means to be the land and water and air of our surroundings. We are the outside. We are our environment.” So, in a way, one could say I was, for awhile, becoming Iceland. And now, slowly but surely, coming back to Berlin."
berlin  iceland  water  hardness  2018  elisehunchuck  reykjavík  chemistry 
6 hours ago by robertogreco
Chemistry prof sues for $20m over alleged gender discrimination
Univ of Arizona professor Katrina Miranda has sued the university over allegations of grossly underpaying female faculty and giving them inferior lab spaces (etc.) (published Dec. 2018)
science  chemistry  arizona  social_justice  women_in_science 
2 days ago by MsHsi
Hackaday Supercon - Sam Zeloof Home Chip Fab: Silicon IC Fabrication in the Garage - YouTube
"It takes about 66 steps and 12 hours total to make these (..)
Semiconductor devices [work by] having non-linear characteristics (..)
Non-linear characteristics engineered with doping (N-type: extra electron, P-type: absence of electron in lattice) (..)
Doping: in industry this is done using ion implantation (..) you could not attempt this at home (..) basically [it is] a massive particle accelerator and it uses voltages of hundreds of thousands of Volts to a million Volts, accelerates the atom you want to dope the silicon with and slams it into the waver (..) the second reason why ion implantation is ridiculous[:] (..) if you want to dope with phosphor and boron - that's phosphine and diborane gas (..) those are two of the worst gases you could ever deal with, and something like 50 parts per million is lethal to humans; you don't even have to breath it, it will go into your skin (..)
I found the best way to get boric acid is Roach and Ant killer, it's on Amazon, you can buy this for 10 bucks (..)
Solar cell using phosphoric acid from Coca Cola (..)
Hyrofluoric acid: Rust Stain Remover (..)
Modern ICs can have 8+ metal layers"
ic  semiconductor  chips  electronics  complexity  diy  chemistry  vacuum  amazon  sophistication  supercon 
6 days ago by gohai

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