(at around 32 mins) The sealed chambers in the Vatican Archives are said to be at a "partial vacuum", i.e. low air pressure. This is standard procedure for scientific laboratories or other locations where the goal is to stop contaminants getting out, because the low pressure ensures a constant flow of air into the room rather than back out of it. However in an archive, this would constantly draw in outside air and contaminants through any imperfect seals or the use of doorways. Real archives have a high-pressure atmosphere instead, which ensures a constant flow of air out and therefore keeps contaminants from entering. It's possible to have a low-oxygen atmosphere that still has a higher pressure than normal air.
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05/03/2025 alle ore 07:50
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