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Originally Posted by Lamphater
What kind of pressure exists inside current spacecraft? psi? Atmospheres?
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I believe pretty much everything these days (ISS, Shuttle, Soyuz, Shenzhou) normally keep around sea level pressure.
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What mixture of gasses are used for breathing inside current spacecraft?
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Oxygen/Nitrogen.
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What mixture of gasses are used during spacewalks?
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Oxygen. Suits are kept at lower pressure than the spacecraft to make it easier to flex joints (limbs, hands).
Oxygen tank or hose.