Despite all my rage I’m still a rat refreshing this page.

I use arch btw

Credibly accused of being a fascist, liberal, commie, anarchist, child, boomer, pointlessly pedantic, a Russian psychological warfare operative, and db0’s sockpuppet.

Pronouns are she/her.

Vegan for the iron deficiency.

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Joined 1 year ago
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Cake day: July 2nd, 2023

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  • Me approaching Foss developer with bug: Pardon me, if you could grace this lowly worm with but a moment of your attention; I with me a bug report, and I believe I have found the section of code responsible. This inadequate being lacks the technical expertise to fix it and would be eternally indebted if you would turn your monumental skills upon its trifling problems. It would please me immensely if my paltry efforts were of some assistance.

    This user: SOFTWARE NO WORK FUCK YOU!







  • Yeah that doesn’t mean we’re running on an alien projector. Science communication of theoretical physics is horrible.

    Anytime you find yourself getting excited about some galaxy brain SciFi stuff just clap out some chalk board erasers and inhale the dust. That’s about how pleasant and exciting theoretical physics is (and how worth doing, fight me you keyboard tapping nerds) and it should help you get in the mood for appreciating findings.


  • Just to talk in international units to include everyone: I was under the impression it was supposed to operate at 1 mbar or 1/1000th of an atmosphere. That’s into the transition between viscious and molecular flow iirc (for air at normal temps anyway). You’re probably still pumping down with something like a scroll pump but it’s not very efficient anymore.

    Thinking about the number of opportunies for leaks. Every joint, every screw, every pump connection. How they all shift against each other as the sun warms and cools them, how you relieve the strain without introducing pourous materials. It’s a fucking nightmare, and even if you manage all that you need to be pumping on it every few meters 24/7 to keep pressures that low with the realistic amount of leaks/in order to be able to pump down the local area where one occurs.

    Like imagine if you needed a phat motor on every block to make roads work. The infrastructure demand is just unreal


  • I used to work in a vacuum lab and one thing to consider is pumping efficiency drops as pressure drops. So everything leaks all the time right, and one strategy is to just pump harder.

    However at low pressurers nothing is pushing the air into the pump for extraction, something like a bend can stop gas flowing around it dramatically where in high pressure the gas behind just pushes it through. So it gets more and more energetically demanding to keep pace with leaks.

    Also pressuring a giant tube to multiple atmospheres also sounds like a nightmare. It’s hard enough to keep pool toys inflated :p



  • Fair enough, I don’t drink many sweet drinks and tried to carbonate soda water that way.

    Re head space, you also need to make sure you’re leaving enough when you open it. You’re only very lightly carbonating with 3.5 g. Most soda water and softdrinks have a head pressure of around 70 psi, the bottles can actually spike to around 150 when dropped which is sort of terrifying. Without the addition of all the crap they add to slow nucleation bottles can erupt very merily when opened!

    When making my own soda water (I just hook bottles up to a regulated stream of co2 and shake) I do actually add some but only about 1/8 of a teaspoon per litre.

    Making things slightly salty makes them nice and I find it helps reduce some of the harsh acid taste the carboxylic acid. Also it seems to modify how the bubbles form which is interesting. Maybe a surface tension of water effect? I’m unsure there.




  • Good question. The answer technically is maybe! however a few caveats.

    Charcoal washes away into the ocean where it mysteriously disappears https://www.sciencedaily.com/releases/2013/04/130419160715.htm it seems to enter the carbon cycle rather than get fixed. So maybe we could prevent that if we buried it very deep and sealed it in. Remember we are looking for a centuries long solution.

    In practice: charcoal compacted has a density of like 1.5 g/cm3 coal is about 1.8. They’re both mostly carbon, we would need to bury a loooot of charcoal. We have dug up and burned tens of billions of tonnes, that is a lot of charcoal to bury and not just in the sort of open cut surface mines coal is usually excavated from.

    Further making charcoal costs energy, even if you fuel it with the wood you’re processing. It’s a staggeringly expensive prospect to make billions of tonnes. There are around 280 billion tonnes of carbon that need fixing, that is just atmospheric. Significant portions are dissolved in the ocean and would start to come out as we reduced atmospheric carbon.

    Carbon fixation is an unimaginably large project, we would need cheap fusion and decades to make it practical. Essentially you want to reverse the energy consumption of everyone on earth for the last 200 years, it just isn’t realistic.

    For the few thousands of years we’re pretty much stuck with whatever we emit. Barring massive technological changes that are unforseeable