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LH2
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LH2

LH2 is an acronym used in the aerospace industry, which stands for Liquid Hydrogen. Hydrogen is found naturally in the H2 form, thus the name. LH2 is a common liquid fuel for rocket applications.

Liquid hydrogen has a very low density of 70.8 kg/m³ (at 20 K), so storage tanks for it have to be quite large.