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Two station astronauts each need to perform three 8-hour EVAs during their 13-day mission to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. How much oxygen will be needed to accomplish this? The units for this math problem are kilograms.
Each EMU has oxygen tanks (similar to scuba diving tanks) that work with a carbon dioxide removal system to allow a 6- to 8.5-hour spacewalk. Without the ability to remove carbon dioxide, the oxygen in the tanks would run out more quickly, because much would be tied up in exhaled gas. The amount of oxygen consumed, and carbon dioxide produced by a crewmember is dependent on his/her metabolic rate. (The life support system holds other things that get consumed during a spacewalk as well, including a battery and cooling water.) Each suit contains .54 kilograms of oxygen (at a pressure of 5,860.5kilopascals) for one EVA lasting between 6- and 8.5-hours.
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