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| − | '''Liquid Hydrogen''' is a common fuel for rocket applications. In the aerospace industry, its name is often abbreviated to LH2. Hydrogen at normal temperature and pressure is a gas and to exist as a liquid must be compressed and cooled to a low temperature, | + | '''Liquid Hydrogen''' is a common fuel for rocket applications. In the aerospace industry, its name is often abbreviated to LH2. Hydrogen at normal temperature and pressure is a gas and to exist as a liquid must be compressed and cooled to a low temperature, 208 K (−423°F). Once liquified it can only be maintained as a liquid in thermally insulated ([[cryogenic]]) containers. |
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. | 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. | ||
| − | In [[rocket engines]], liquid hydrogen is frequently used as a coolant for the engine nozzle and [[combustion chamber]] before being mixed with the oxidizer and burned. This is referred to as [[ | + | In [[rocket engines]], liquid hydrogen is frequently used as a coolant for the engine nozzle and [[combustion chamber]] before being mixed with the oxidizer and burned. This is referred to as [[Regenerative cooling ]]. |
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[[Category:Glossary]] | [[Category:Glossary]] | ||
{{Stub}} | {{Stub}} | ||