Liquid hydrogen (LH2 or LH2) is the liquid state of the element hydrogen. Hydrogen is found naturally in the molecular H2 form.
To exist as a liquid, H2 must be cooled below hydrogen's critical point of 33 K. However, for hydrogen to be in a full liquid state without evaporating at atmospheric pressure, it needs to be cooled to 20.28 K (−423.17 °F/−252.87°C). One common method of obtaining liquid hydrogen involves a compressor resembling a jet engine in both appearance and principle. Liquid hydrogen is typically used as a concentrated form of hydrogen storage. As in any gas, storing it as liquid takes less space than storing it as a gas at normal temperature and pressure, however the liquid density is very low compared to other common fuels. Once liquefied it can be maintained as a liquid in pressurized and thermally insulated containers.
Liquid hydrogen consists of 99.79% parahydrogen, 0.21% orthohydrogen.
Read more about Liquid Hydrogen: History, Spin Isomers of Hydrogen, Uses, Properties
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