Comment on If I stood on a precision scale and farted, would I get lighter or heavier?
PhilipTheBucket@piefed.social 1 day ago
Fart gas is warmer than the surrounding atmosphere, therefore less dense. Your digestive system is under very slight compression (10-20 mmHg gauge pressure according to the internet), which I would guess does not equate to enough pressure to be more significant than the temperature gradient. Fart gas is also less dense than air at a given pressure by a pretty significant margin (1.06 g/L compared with 1.20 g/L).
When you fart, you're releasing gas that is less dense than the atmosphere, which means you get slightly heavier. Think of yourself as a hot air balloon with a very tiny chamber, and when you release a 90 milliliter fart, you lose a little buoyancy and sink a little. You get heavier when you fart.
I haven't done the math, but I looked around on the internet at some numbers, and that's what I think. I also ignored this because it is clearly AI slop, which is a little upsetting.
Couple of nuances with this that are not fully accounted for.
You seem to be assuming that the volume is immediately replaced by the external atmosphere, which I doubt is valid, more likely that the volume of the person would decrease, at least temporarily. The weight of 1 Liter (assuming a massive fart) of air is 1.275g according to wolfram, so, using your density numbers above, 1.275 * 1.06/1.2 = 1.126g lighter. Measurable with a really good scale, if the 90ml fart volume is realistic (has to be more realistic I guess), that's ~.1g,
Think of yourself as a hot air balloon with a very tiny chamber, and when you release a 90 milliliter fart, you lose a little buoyancy and sink a little. You get heavier when you fart.
No, you get denser, but not heavier.
You seem to be assuming that the volume is immediately replaced by the external atmosphere, which I doubt is valid
No, I was assuming your volume decreases. I don't actually know that to be the case, but my assumption is that there isn't "extra" space inside a person, and so if you lose material from a part of your body that isn't encased in anything rigid your volume decreases slightly.
So maybe I did have my terminology wrong. When a hot air balloon deflates, it falls. The density went up, but that's not what's directly relevant. The weight went down, I guess, but the "number on the scale", weight minus buoyant force, went way way up, because it lost some lower-density volume that was making the whole thing float. The weight (in a strict physics sense) went down, sure. But the number on the scale (which I was incorrectly calling "weight") went up. Same thing for a farting person.
I feel like like I get denser everyday no matter I do.
When you fart, you’re releasing gas that is less dense than the atmosphere
Speak for yourself…
This is like what would happen if Bill Nye needed to worry about sweeps.
How many litters of gas I’d need to pass to lose a kilogram on the scale? Let’s consider I have indestructible guts that can be ever enlarging without rupture and we ignore the linear increase of pressure that would happen
aeternum@lemmy.blahaj.zone 7 hours ago
so that’s why i can’t lose weight.