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<h2 class="hd hd-2 unit-title">Temperature and Humidity Control</h2>
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<h2>3.3.1 Temperature and Humidity Control</h2>
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<p>Although the human body can adapt to various climates and conditions, there is a limited range of temperatures and humidity levels in which humans are most comfortable. When in space, we must rely on temperature and humidity control systems to replicate these conditions in the spacecraft cabin. In the next video, Prof. Hoffman explains how spacecraft such as the Space Shuttle and the International Space Station use radiators and dual-fluid heat exchanger systems to expel heat and create a comfortable atmosphere in which to live and work.</p>
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<h2 class="hd hd-2 unit-title">Atmospheric Pressure and Composition</h2>
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<h2>3.3.2 Atmospheric Pressure and Composition</h2>
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<p>In addition to comfortable levels of temperature and humidity, it is absolutely critical that astronauts in space have adequate oxygen for breathing. As we will learn, this is not just a matter of how much oxygen is in the atmosphere, but also the pressure of the air on the body. In the following video, Prof. Hoffman introduces the concept of oxygen partial pressure and discusses the dangers of hypoxia, or insufficient oxygen level.</p>
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