First off, I hope this question is not too offensive. Discussing technicalities of a genocide will certainly disgust some. I am in no way trying to condone nazi crimes. I am also not sure whether it makes sense to search for rational thought in genocide. Here goes anyway:
Nazi death camps used shower heads to introduce a gas into the gas chambers, thereby killing people. The gas used was Zyklon-B, an industrial product produced by a single supplier, and likely relatively expensive. It also meant that the gas chambers had to be aerated for a number of minutes before soldiers or forced laborers could enter the gas chambers to drag out the corpses.
Why didn’t they simply use CO2? It’s a byproduct of basically any fire. It’s cheap and could have been produced on-site trivially. It’s also part of normal air and only toxic in high concentrations, likely meaning less danger to soldiers.
First: Zyklon B was mainly used in Auschwitz, many other camps did use CO or engine exhaust gases.
Nazi death camps used shower heads to introduce a gas into the gas chambers
No, the showers were simply fake. Zyklon B was inserted from above into metal pipes so it would fall down into the gas chamber. You can see an animation here: https://www.zdf.de/dokumentation/terra-x/die-gaskammern-in-auschwitz-birkenau-creative-commons-100.html
and likely relatively expensive
It was widely used for killing insects for example on ships, cooling houses, mills or other in other storage facilities. In fact the overwhelming part of Zyklon B going to concentration camps was indeed used to kill fleas or lice and not for killing humans. The price was 4.55 RM in 1943 per kg which is roughly the same in Euros today.
It also meant that the gas chambers had to be aerated for a number of minutes
30 to 40 minutes
Why didn’t they simply use CO2
Zyklon B was again a mass product with the corresponding production capacities already there and not expensive. Also it is estimated that around 4kg of Zyklon B are able to kill 1000 people. It is also fast acting and thereby simply very effective in that sense. Plus it was also simple to transport and store as it came on a carrier material, so pressure gas bottles were not necessary but simple metal containers were used.
So, for the record, while I didn’t really write anything in here, I did read the entire thread and learned a little bit from each of the top-level comments (bar the downvoted one): Thank you for the responses and thank you for debunking me!
(I guess I should have put a little more effort into research.)
This is meta but…
This post demonstrates the utility of having an r/askhistorians equivalent on lemmy. I seem to remember them being quite outspoken against Reddit’s bullshit, but I’m not sure if they went anywhere.
I don’t think they stayed:
Sarah Gilbert is a postdoctoral associate at Cornell University and research director of Cornell’s Citizens and Technology Lab; she studies content moderation, online communities, and research ethics. She’s also a moderator for r/askhistorians, a subreddit known for complex modding systems (r/askhistorians is not one of the subreddits with moderators removed by Reddit).
According to Wikipedia, they used a lot of different approaches. Zyklon-B was abundant, as it was used as an insecticide, but was dramatically more poisonous to humans. 4kg of the poison can kill 1000 people. As far as I understand, it proved itself to be the most efficient method for killing a lot of people reliably
They did sort of use CO2/CO in the earlier days, in the form of poorly maintained van trucks that would drive around the camps with their exhaust piped directly into the back of the van. That was slow and inefficient though, as the truck had to run long enough to actively displace all the oxygen within the volume of the van.
Zyklon B from its Wikipedia page was intended as a pesticide so there was already a large industrial supply lying around. It works on a cellular level and will cause widespread cell death within 2 minutes of inhalation at extremely low concentrations, making it ultimately much faster with less maintenance.
I’m not a historical expert, but the deaths caused by Zyklon B are also described to be much, much more violent than simply passing out from oxygen deprivation- and I could posit that the Nazis, viewing jews et al. as not human, would have preferred such a death for them.
I cannot remember when or where I heard or read about this, so take it with a grain of salt. But I recall hearing something about the people who had to remove the bodies from trucks where people had been gassed with CO2 finding the corpses so gruesome and agonising, as opposed to more peaceful looking bodies of people killed with other gases, that they stopped using it. Presumably the difference was because of how slow or quick the death was.
I doubt they would have cared the tiniest bit later on when it was other concentration camp victims who had to clear the bodies.
I have to admit that I’m curious about something similar; the death camps and ots mechanism seemed highly inefficient, but the fact that I have to preface any questions on the topic with how much i detest the actual concept made me conclude that it’s probably best not to ask. That’s the annoying fact about being interested in finding efficient technical solutions while also hating nazis and everything they stood for.
During Operation Reinhard they mostly used carbon monoxide.
Why didn’t they simply use CO2? It’s a byproduct of basically any fire.
I think that’s carbon monoxide. CO
CO kills by sending you to sleep and then binding to oxygen very tightly in the blood asphyxiating you.
CO2 drives the breathing cycle and causes you to unctrollably hyperventilate. You tend to die of a heart attack through panic.
Very different. I suspect a large crowd of people panicking would be very difficult to control.
It’s cheap and could have been produced on-site trivially. It’s also part of normal air and only toxic in high concentrations,
I think you gave another reason yourself. Smaller quantities of toxin are easier to manage / use.
And neither could have competed with Lynx Africa.
