Category: physics
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Magnet Mushroom
At the end of 2013 Sonny Hallett and I invented a game. We’re calling it Magnet Mushroom, and you can play it too if you have an iron or steel tray, a bunch of magnets and some small pieces made of iron or steel. We used a baking tray, a pack of polished magnetite from…
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Ionic Bonding
What Ionic Bonding Is Ionic bonding is the type of chemical bonding that binds non-metals with metals, and occasionally other things*, forming ionic compounds. An ion is just an atom (or sometimes a molecule) with an overall electric charge – many atoms and molecules have exactly as many electrons as they have protons, so the charges cancel out; when that doesn’t hold true, we end up…
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The Everyday Signs of Light Waves
Light, like all the basic constituents of our universe, seems to be made of waves. Waves that act a bit like particles, sometimes, but which spread out and interfere with each other just like other waves. It’s about 200 years since physicists finally agreed that light behaves like a wave, after Poisson proved himself wrong…
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Iron Noder
This November I posted 30 finished pieces of writing on Everything2, on whatever I felt like writing about at the time. By doing so I completed the Iron Noder Challenge, which has been running every November since 2008. This was the first time I took part in earnest – making the effort to write and…
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Ice and Frost
I think most people don’t pay nearly enough attention to what they’re walking on, especially in cold weather. The richness of the patterns that ice forms is staggering, and provides an intriguing glimpse into the physical processes going on both at a molecular level and on a much larger scale. Some of the most fun…
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Caustics
I have been fascinated by caustics for a long, long time. I still remember the first time I noticed them – a bright, ethereal form dancing in the shadow of my mother’s wine glass. I was entranced by the way the light moved when the wine swished in the glass, and disappointed when my usually…
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Skywatching
I recently finished reading The Cloudspotter’s Guide (see review), and have concluded that it is one of my all-time favourite books. I have made skywatching a hobby for as long as I can remember, but the book has raised my awareness of the skies above us to new heights. As it happens, this has coincided…
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Salt Forms
The salt bin opposite my flat provides me with a suprising amount of intrigue. Somewhere down the line, it filled up with water enough to become distended – or became distended enough to fill with water – so now it sits there and forever grins invitingly, like some kind of fat plastic crocodile. It’s permanently…