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<h2 class="hd hd-2 unit-title">Oxygen Supply</h2>
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<h2>3.4.1 Oxygen Supply</h2>
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<p>It goes without saying that a steady supply of oxygen is one of the most important requirements for surviving in space. There are several ways of providing astronauts with oxygen, ranging from launching storage tanks into space to generating oxygen via chemical reactions. Prof. Hoffman will describe these techniques in the following video, and explain how they relate to open-loop or closed-loop modes of operation.</p>
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<h2 class="hd hd-2 unit-title">Carbon Dioxide Removal, Part 1</h2>
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<h2>3.4.2 Carbon Dioxide Removal, Part 1</h2>
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Describe the various ways in which carbon dioxide can be removed from the spacecraft atmosphere" type="button" id="LD">MO 3.5</button></p>
<p>One of the biggest byproducts of human respiration is carbon dioxide (CO\(_2\)). On Earth, carbon dioxide emissions are partially offset by plants, which utilize CO\(_2\) in photosynthesis to produce oxygen. In space, however, we must take active measures to remove excess CO\(_2\) from the cabin atmosphere. Another challenge is that because oxygen is a precious resource, we can't afford to simply discard air that has been exhaled, since it still contains significant amounts of oxygen. Instead, we use recycling systems to continually remove (or "scrub" out) carbon dioxide from the air so that it can be reused.</p>
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<h2 class="hd hd-2 unit-title">Carbon Dioxide Removal, Part 2</h2>
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<h2>3.4.3 Carbon Dioxide Removal, Part 2</h2>
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<p>As with oxygen production, there are several ways of carrying out CO\(_2\) removal, including both open-loop and closed-loop ECLSS techniques. In the previous video, we learned about the use of two types of chemical absorbers. In the next video, we finish our discussion with another method: cycling CO\(_2\) removal systems.</p>
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<h2 class="hd hd-2 unit-title">Trace Contaminant Removal</h2>
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<h2>3.4.4 Trace Contaminant Removal</h2>
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<p>Carbon dioxide is not the only undesirable pollutant with which astronauts have to contend. There are a number of other physical and chemical contaminants in the spacecraft environment that can pose dangers to human health and well-being. In the following video, Prof. Hoffman explains how we deal with dust, food crumbs, smoke, methane, ammonia, and other contaminants in the vacuum of space.</p>
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<h3 class="hd hd-2">Video: Trace Contaminant Removal </h3>
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