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Line 73: There are two [[spin isomers of hydrogen]]; whereas room temperature hydrogen is mostly orthohydrogen, liquid hydrogen consists of 99.79% parahydrogen and 0.21% orthohydrogen.<ref name="IPTS-1968"/> Hydrogen requires a theoretical minimum of 3.3 kWh/kg to liquefy, and 3.9 kWh/kg including converting the hydrogen to the para isomer, but practically generally takes ~~10-13~~10–13 kWh/kg compared to a 33 kWh/kg heating value of hydrogen.<ref>{{Cite report \|url=https://www.hydrogen.energy.gov/pdfs/9013_energy_requirements_for_hydrogen_gas_compression.pdf \|title=DOE Hydrogen and Fuel Cells Program Record: Energy requirements for hydrogen gas compression and liquefaction as related to vehicle storage needs \|last=Gardiner \|first=Monterey \|date=2009-10-26 \|publisher=United States Department of Energy \|issue=9013}}</ref> ==History==

Liquid hydrogen: Difference between revisions