Pressure, vacuums, and the on earth equivalent? Answered
One atm is equivalent to about 14.7 psi. Does that mean that if one was in a perfect vacuum a vessel sporting 1 atm would need only hold the pressure of 14.7 psi? It seems to me that in space (not a perfect vacuum) a craft would only need to hold maybe 12 psi (of course when messing with human life I would definitely allow for 150 to 200% tolerance, but in the end 24 psi still isn't very much is it. Is there more to it than this, or are all those quotes about how hard it is to deal with a vacuum and how things must be super strong a little over blown. Going just 11 meters under water exposes you to a little over double air pressure at sea level. Someone in just a diving suit has been to over 60 times atmosphere and the deepest submarine dive I could find was 1083 atm at around 11000 m. It just seems to make holding out a vacuum a little overrated.