Quote from: crickleymal on July 12, 2021, 03:29:40 pmIt's also heavier than air and will settle in any hollows...sorry but that is incorrect. Badino at https://caves.org/pub/journal/PDF/v71/cave-71-01-100.pdf provides a readable (not much maths) explanation of why not. Alternatively if SF6 (molecular weight 146) did settle out, then we would all be dead because xenon (molecular weight 131) in the air would also settle out. The key mitigating factors are drafts and thermal currents which mix the air sufficiently to stop such stratification. The simple explanation for CO2 apparently ponding is because it is being evolved in the zone and is not be diffused away fast enough. The same would be true around the release point of any gas. But release volume dependent, beyond a certain distance only dilution will occur.
It's also heavier than air and will settle in any hollows...
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