Re:iPhones are allergic to helium
by brianpgordon on Tuesday October 30, 2018 @11:22PM
(#18343103)
That is not true by any stretch of the imagination. If gases behaved like that then we'd all be choking on a layer of argon with all of the oxygen out of reach above us. No, gases diffuse and mix easily.
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Gases diffuse and mix given enough time. There's not enough time when you have a massive indoor gas leak.
Even outdoors, large amounts of CO2 tend to sink to the ground and suffocate people in low-lying areas. Look up Lake Nyos for a particularly grizzly example of that.