| ▲ | jazzyjackson 4 hours ago |
| > if left untreated, is known for spontaneously combusting as it decays and oxidizes. Does anyone remember the 90s when as a laymen it seemed like an open debate whether humans would occasionally combust spontaneously? I guess it stopped happening once falling asleep with a cigarette lost popularity But my point is I wasn’t aware that “spontaneous combustion” was a real thing one has to worry about it. Linseed oil rags will do this too, and that’s why patent leather shoes are coated in plastic now instead. |
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| ▲ | ceroxylon 8 minutes ago | parent | next [-] |
| There is a safety standard for managing flour dust in places like bakeries for spontaneous combustion reasons: https://www.nfpa.org/product/nfpa-654-standard/p0654code |
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| ▲ | tdeck 4 hours ago | parent | prev | next [-] |
| This can happen to mulch as well if it's left in a very big pile for a long time. |
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| ▲ | cogogo 3 hours ago | parent | next [-] | | Regularly happens to the same pile of mulch at a lot in Boston. No idea why they have been allowed to keep storing it. https://www.universalhub.com/2026/mulch-fire-brings-all-jake... | |
| ▲ | toast0 2 hours ago | parent | prev [-] | | If you have a big enough pile of organic matter, exothermic decomposition can lead to fire, if the conditions are right. Commonly happens in grain silos, mulch piles, etc. It really doesn't take that large of a pile of grass clippings or wood chips to get some steam coming out and a lot of steam if you disturb the pile. | | |
| ▲ | AngryData an hour ago | parent [-] | | Yep, many hay barns have caught fire because the hay was bailed while too wet and it is fermenting so vigorously. |
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| ▲ | aitchnyu 3 hours ago | parent | prev | next [-] |
| HowStuffWorks used to be full of expert animations of automatic transmissions and helicopters around 2006 but they had a multipart article on spontaneous combustion, with anecdotes of 1890s people who retained too much ethanol. |
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| ▲ | tlonny 4 hours ago | parent | prev | next [-] |
| https://en.wikipedia.org/wiki/Wick_effect |
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| ▲ | dreamcompiler 4 hours ago | parent | prev [-] |
| Human spontaneous combustion is a silly myth. Other kinds like oily rags and apparently fishmeal are very real. |
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| ▲ | jazzyjackson 4 hours ago | parent | next [-] | | Maybe it was more of being a middle schooler than a wider social phenomenon, but silly myths got a lot of play in the days before Google! | | | |
| ▲ | Zancarius 4 hours ago | parent | prev [-] | | Grain dust and flour also come to mind. Essentially anything with the appropriate fuel/air mixture can combust, often explosively, even if we otherwise think of it as food! | | |
| ▲ | SAI_Peregrinus 3 hours ago | parent [-] | | Those events aren't spontaneous combustion, an ignition source is needed to cause a dust explosion with flour, grain, or sawdust. Spontaneous combustion of something like linseed oil happens with no external ignition source. Spontaneously combustible substances undergo exothermic reactions in normal conditions, e.g. when drying, curing, being exposed to air, or similar. They have low enough flash points that their own heat is enough to cause ignition, which is why you never hear about concrete spontaneously combusting despite having an exothermic curing process. | | |
| ▲ | bell-cot an hour ago | parent | next [-] | | > which is why you never hear about... It might help that concrete is not combustible to begin with. Vs. (say) linseed oil definitely is. | |
| ▲ | dreamcompiler an hour ago | parent | prev [-] | | Exactly. Grain dust is very dangerous because a small spark can make it explode, but the spark is absolutely necessary. If you leave a pile of oily rags in your garage and wait a few hours, your house could burn down. No spark needed. |
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