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Joined 2 years ago
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Cake day: June 22nd, 2023

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  • Lets start by assuming the balloon stays the same size as it rises in the air column and we’ll ignore the temperature drop. The pressure and density of the gas inside the balloon remains the same, but at some point the air density outside the baloon will drop to match the density of helium inside the baloon. At that point the balloon would stop rising as the weight of the atmosphere it displaces is the same as weight of the helium filled balloon. It’s like a little boat on a sea of air.

    However, balloons don’t stay the same size. As they float up the atmospheric pressure drops. The balloon will expand because the pressure inside the balloon is higher that the pressure outside. It still has a bouyant force on it because the weight of atmosphere it displaces is still larger than it’s own weight, so it continues to go up. Outside pressure continues to drop. Balloon continues to grow. Eventually the balloon bursts.




  • I think this is true for lots of people. I also think there’s a bunch of us that have never had that feeling of it being a memorisation task.

    In fact, the reason I liked maths and science was because it wasn’t memorisation. Unlike languages (for example) you could always work out the bit you forgot, and didn’t need to depend on some made-up aide-memoire that only applied 75% of the time and remember what 25% it didn’t apply to.

    All I can think is that some early teacher failed you, and didn’t lay out how the foundations worked.




    1. Until recently any word against Israel was met with the antisemitism hammer. I don’t think they realise how outdated that view is.
    2. Their hands are deep in the cookie jar. They’ve been supplying arms for 50+ years. “You weren’t meant to kill people with them!”
    3. Trump in particular doesn’t really care. All he sees is an opportunity to make money rebuilding Gaza.
    4. U.K. leadership has a real problem standing in opposition to Trump. They’ll insult him in private, but whisper sweet nothings into his ear when in person. They think they’re being clever. They’re not.


  • wewbull@feddit.uktoLinux@lemmy.mlWhy?
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    10 days ago

    I’d just built my first PC and had no love for Win 3.1 which was rapidly becoming the default. I wanted to keep codíng having come from from Atari STs and had no desire to learn the windows APIs. An OS that came with C compilers by default was higher level than I was used to as I’d been doing 68000 assembler on the ST, but it was still low level enough.

    IIt was also similar enough to the Sun IPCs and IPXs that I was using at university.