News for hackers. Stuff that matters.

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 @11:15PM (#27468895)
10% CO2 (> 40000ppm) is lethal. Have I been brainwashed to ignore the people dropping dead on the streets?
[ Parent | on HN ]
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.
[ Parent | on HN ]