I don't see any "missing air circulation" argument on that link.Intenso wrote: ↑Sun Jan 26, 2020 7:04 amOk so those perfectly round holes would indicate the use of the regime gas containers in a "legitimate" fumigation contraption for clothes where the can was "automatically opened" by the machine and a can with ragged edges that looks like it was opened by hand with a swiss army knife would indicate the use on the roof of a homocidal gas chamber?
I read the link http://www.vho.org/GB/Journals/JHR/7/1/Berg73-94.html and he does not discuss the fact that body lice dont have lungs and so his "missing air circulation" argument would apply to lice but what concentration of HCN would be needed to kill humans versus lice that ingest the poison thru their skin and not actively thru a lung? 1:100? So the thousands of human lungs would be the "missing air circulation" he is looking for in the homocidal chambers...
Berg is mistaken with his forced circulation argument. The reason for forced circulation is to push the HCN through things such as clothing and small cracks in the wall (and the lice body itself as you pointed out) with pressure.
Humans are much larger and do not need the gas to be pushed through small things to get to them. They inhale the gas around them and die after inhaling a lethal dose.
The lethality of HCN (in terms of "lethal dose" - weight of toxin divided by weight of animal) can't be very significantly different between different animals but the way in which that dose is received is easier for lunged animals - as you point out. Drawing in the gas through the lungs gives a lethal dose about 100 times more quickly as you say than absorption through the skin. One usually talks about the "lethal concentration" (in ppm in air) that results in a lethal dose over a certain amount of time.
The short of it is that the lice situation is different than the human situation. The gas needs to reach hidden lice and be pushed through their bodies whereas it is much easier for the gas to enter the breathing space of the human - who breathes in a lethal dose in a certain amount of time.
The amount of Zyklon used to fumigate a building against lice is about 8-10 g per cubic meter for about 16 hours - but there are considerations to be taken into account which would change each of these parameters accordingly.
Hoess and others testified that similar concentrations were used in the alleged gassings at Auschwitz - but over a much lower time period.
EDIT: You can read the German wartime zyklon building fumigation guidelines here. This was document NI-9912 at the postwar trials.
EDIT: We usually refer to the initial amount of zyklon used (the size can(s)) as the "dose" or dosage used as well - which is a different sense of the usage of that term I used above. So for instance, the "dosage" used in Krema II at Birkenau for a particular gassing was about 6 kg - 6 1 kg cans according to Hoess.
BTW, a 1 kg can of zyklon has 1 kg of hydrocyanic acid adsorbed in gypsum pellets in it. The weight of the whole can and its soaked pellets in it is greater than that of course. The weight is referring to the hydrocyanic acid content.
Hydrogen cyanide gas (HCN) evaporates out of the soaked pellets and diffuses in the air and throughout the room.