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

What pressure and composition of atmosphere within a space ship is maintained during space travel?
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Here’s one part of an answer to your multi-part question: the ENose.
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Description : Pick out the wrong statement. (A) In a batch reactor, which is exclusively used for liquid phase reactions; temperature pressure and composition may vary with time (B) In a semi-batch reactor, ... system (D) In a continuous flow reactor, both the reactants and the products flow out continuously

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Description : A space ship traveling toward Mars at 0.6 times the speed of light c shoots an ELECTRON beam at Mars. If the electrons travel at 0.6 c RELATIVE TO THE SPACE SHIP, at what speed do the electrons impact the surface of Mars? w) 0.6 c x) 0.88 c y) 1.2 c z) 1.34 c

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Description : In an ideal mixed reactor (at steady state), the (A) Space time is equivalent to holding time for constant density systems (B) Composition throughout the reactor remains same (C) Exit stream has the same composition as the fluid within the reactor (D) All (A), (B) and (C)

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