Aircraft Pressurization Beginner's Guide - AeroSavvy
2015-5-22 · At 18,000 feet, the atmospheric pressure is down to 7.3 psi, about half the sea-level pressure. There just isn't enough oxygen in a breath of air to adequately supply the brain. At this pressure, a healthy adult has only 20-30 minutes of useful consciousness. Airliners fly …
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