| http://www.w3.org/ns/prov#value | - Exposure to hydrogen damages many kinds of metal. - Gases leak, especially gases with a low molecular weight, which is no big deal with helium, but can create an invisible fire with hydrogen. - Mistakes happen, and accidentally pressurizing the LOX tank with GH2 would be a disaster. - Using two pressurant gases instead of one adds complexity, which reduces operability, increases the number of thin
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