What pressure and composition of atmosphere within a space ship is maintained during space travel?

Here’s one part of an answer to your multi-part question: the ENose.

The atmosphere aboard the shuttle is 22% oxygen and 78% nitrogen. The pressure is maintained at 101 kPa (14.7 PSI). This is very similar to the terrestrial atmosphere. Pressure is lowered to 70.3 kPa and oxygen content is increased to about 26% the night before extra-vehicular activity to purge excess nitrogen from the bloodstream and reduce the risk of decompression sickness.

CO2 exhaled by the crew is removed by passing the air through a molecular sieve (a two-layer bed of zeolite) that also removes excess water caused by exhalation. This sieve is periodically purged by exposing it to the vacuum of space. Oxygen consumed by the crew is replenished from liquid oxygen stocks.

(source: Fundamentals of Aerospace Medicine by Jeffrey R. Davis, Robert Johnson, Jan Stepanek)

@Harp Yay! Nice answer!

@Harp Could you be more specific?
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just kidding!

@Harp thank you. i will be using this data for my group four project lolol.

thanks, you saved me… but i found similar information right after i posted this question, but its still good data!~

GA

Why, are you making a flying saucer? Watch “The Mouse on the Moon” and you will see how it’s done!

p.s. it doesn’t work so well with a teapot