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Hydrogen has to be in gaseous state to burn. The boiling point of hydrogen is ~20 kelvins, while oxygen boils at about 90 kelvins and freezes to solid at ~54 kelvins. It is therefore impossible to mix these two for combustion if hydrogen is in liquid state. A non scientific answer to pumping liquid hydrogen directly to the combustion chamber is, that it will ...


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Based on my reading, the biggest disadvantage of hydrogen as an engine fuel is its low density. Even when stored as a cryogenic liquid, it take up more than ten times the space as the same mass of kerosene, which means the same size tanks will hold only about a third as much energy (even though hydrogen has about three times the energy content per kilogram ...


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