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A comment on San Francisco may be first major US city to hit herd immunity, experts say. Parent comment

Re:San Francisco may be first major US city to hit herd immu... by zamalek on Thursday June 10, 2021 @04:39PM (#27465495)
> The net result was always the same: there was half oxygen and half carbon dioxide behind the mask.

Fascinating. Oxygen normally only makes up 21% of breathable air - it would seem that masks are increasing oxygen levels. In addition, where is your null hypothesis test?

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Re:San Francisco may be first major US city to hit herd immu... by ghoward on Thursday June 10, 2021 @09:12PM (#27468171)
The model only tests how oxygen and carbon dioxide replace each other, not nitrogen. So 50% of the 21% is oxygen, the other 50% is carbon dioxide.

Of course, it could be even worse, that carbon dioxide starts replacing the nitrogen behind the mask. More testing needed.

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Re:San Francisco may be first major US city to hit herd immu... by zamalek on Thursday June 10, 2021 @11:15PM (#27468895)
10% CO2 (> 40000ppm) is lethal. Have I been brainwashed to ignore the people dropping dead on the streets?
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Re:San Francisco may be first major US city to hit herd immu... by ghoward on Friday June 11, 2021 @01:50AM (#27469776)
The carbon dioxide is only replaced in the volume behind the mask. If that is not a big volume compared to a full breath (and it isn't), then the carbon dioxide you're breathing in isn't 10%. It's (v_mask * 0.21 * 0.5)/V, where v_mask is the volume behind the mask, and V is the full volume of a breath.
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