Handy to have an offline translation dictionary. I’ve used QuickDic for languages I know how to type, but I notice there are a bunch of more specialised Japanese dictionary apps in F-Droid that can search by radical or OCR if you don’t type or understand the characters.
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Joined 3 years ago
Cake day: February 20th, 2021
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What’d be cool is if when you enter a URL the lemmy interface lets the poster choose an image or even cropped region from the linked page.
20·4 months ago~623 km/h in today’s units.
As long as there’s no cream in it, we’re good.
“South Africa, which is functioning as the legal arm of the Hamas terrorist organization […]”
– https://twitter.com/LiorHaiat/status/1745427037039280207 (https://archive.md/L7AwX)
So… I really don’t know chemistry, and these aren’t the highest quality references, but here goes:
- 4 mol of iron in a heat pack provides 1648.4 kJ of heat. [1]
- 4 mol of iron weighs 223g. [2]
- Recycling 1000kg of steel saves 642 kWh of energy. [3]
- Recycling 0.223kg steel saves 642 * 0.223 / 1000 = ~ 0.143 kWh
- 0.143 * 3600 = 515 kJ
Huh. So maybe heat packs are a reasonable use of scrap iron’s embodied energy after all. Assuming you have a sufficient source of uncontaminated steel filing waste and that it’s economical to collect and process into heat packs.
…But only if you’re heating your water using fossil fuels using an inefficient method! If your water is heated using solar or waste heat capture or a heat pump[4], which would swing the balance way over to hot water bottles again.
You’re not considering the energy required to smelt the iron.
Iron filings (in a collected quantity high enough to make manufacturing these heat packs worthwhile) are not a waste product, they are recycled – saving the smelting of that much new iron.
Sawdust+iron heat packs are a very useful and non-hazardous product, for sure, but aside from situations where a hot water bottle is impractical, hot water bottle still wins.
Potatoes 🥔🧂🍟