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How do astronauts breathe in the space shuttle?

April 26, 2017astronauts breathe space shuttle

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How do astronauts breathe in the space shuttle?

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They breathe artificial “air” that is almost the same as the air on Earth. It is made up of 20% oxygen and 80% nitrogen similar to the air we breathe and it is at a pressure of 14.7psi which is the same as the atmospheric pressure on earth.