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liquid hydrogen (H2)

Liquid hydrogen (H2) is hydrogen in its liquid state, used as a cryogenic rocket fuel; hydrogen gas turns to liquid under standard atmospheric pressure at -262.9°C. When oxidized by liquid oxygen, liquid hydrogen delivers about 40% more thrust per unit mass than other liquid fuels, such as kerosene. Molecular weight: 2.016; density: 0.071 g/ml. Commonly referred to in rocketry as LH2.

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   • cryogenic propellant

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