There are plenty of places on Earth where people live with much lower air pressure...
IIRC, the Apollo era pressure was 5 psi. Probably had to boost it in order to provide an environment that a relatively
non-select portion of the population could get in to space [aboard US craft].
Bloating in females, comes to mind. (Maybe I should say brain swelling comes to mind, first?)
I think it was a "safety" design. That pressure could be maintained long enough for the donning of pressure suits if the capsule acquired 0.5" hole.
To: Calvin Locke
The Apollo era also used a pure oxygen atmosphere. That is what caused severity of the capsule fire in the Apollo 1 test, however that was at a 1 atm internal pressure (14.7 psia, which may not to healthy as well, outside of fire considerations). (Question to freepers who may have worked on Apollo: after the fire did NASA go to an N2/O2 atmosphere in the command module at 14.7 psia, changing to 5 psia pure oxygen somewhere in the flight profile?). I suspect that the ISS has an N2/O2 atmosphere. Could be wrong. Another consideration for the air pressure, since equipment operation was mentioned, is heat conduction, although fans may be needed. Insufficient air density results in less heat carryoff. I have seen power transformers de-rated for high elevation (starting at 4000 feet). Another DUMB question for any aerospace freepers - Can there be convective cooling in a zero-gee enviroment, or are circulation fans needed.
To: Calvin Locke
Mentioning "bloating in females" could be construed as a serious safety issue . . .
posted on 01/09/2004 8:20:02 PM PST
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson