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Cake day: June 5th, 2025

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  • Potential energy (in joules) is mass (in g) times height (in meters) times 9.8 m/s^2 .

    So in order to store the 30 kWh per day that the typical American house uses, you’d need to convert the 30 kWh into 108,000,000 joules, and divide by 9.8, to determine how you’d want to store that energy. You’d need the height times mass to be about 11 million. So do you take a 1500 kg weight (about the weight of a Toyota Camry) and raise it about 7.3 meters (about 2 stories in a typical residential home)? (this is wrong, it’s only 0.001 as much as the energy needed, see edit below)

    And if that’s only one day’s worth of energy, how would you store a month’s worth? Or the 3800kwh (13.68 x 10^9 joules) discussed in the article?

    At that point, we’re talking about raising 10 Camrys 93 meters into the air, just for one household. Without accounting for the lost energy and inefficiencies in the charging/discharging cycle.

    Chemical energy is way easier to store.

    Edit: whoops I was off by using grams instead of kg. It actually needs to be 1000 times the weight or 1000 the height. The two story Camry is around a tablet battery’s worth of storage, not very much at all.




  • The decimalization of money is its own fun history, with a lot of different countries undergoing their own transitions at different times.

    The Spanish dollar, which was the world reserve currency in its heyday, was divided into 8 reals (see how pirates used to refer to money in the form of “pieces of eight”) but issues with the supply of silver led to the introduction of the lesser real de vellón, which eventually settled at 20 to the dollar after over 100 years of uncertainty and confusion.



  • it’s more when people are almost using the metric system then fuck it up, like the “Watt Hour” for measuring energy use.

    Energy is just so important to physics and engineering that it will be measured in whatever unit is most convenient to convert in that particular context: joules as the SI unit, watt hours for electricity usage, calories for certain types of heat or food energy calculations, electron volts in particle physics, equivalent tonnes of TNT for explosion energy, things like that.





  • Throw it away once it’s cooled. If it’s a solidified fat, you can just scrape it into the trash bag. If it’s a liquid oil, then you can throw it into a disposable container (I have a million takeout soup containers on hand at any given time) so that it doesn’t leak everywhere.

    Oil is compostable, but only in proper ratios to the overall organic material being composted, so it’s fair game to put into compostable containers for industrial composting, or maybe small quantities in your backyard compost, but I wouldn’t recommend it unless you know what you’re doing.