Refined hydrogen is most often used as a fuel source by jump drives. Raw hydrogen, often skimmed from the upper atmosphere of a gas giant, can also be used but manufactured Fuel is preferred as it removes any impurities from the gaseous mixture. Fuel can be dangerous to store, and is most often held in special Fuel Tankage aboard spacegoing vessels. Improved Fuel is more refined and might be useful in the production of certain items.
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Content contributed by Raven Zachary.