cryogen refrigerant stored in rocket propulsion how
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Explanation:
Cryogenic fuels are fuels that require storage at extremely low temperatures in ... Some rocket engines use regenerative cooling, the practice of circulating their cryogenic fuel around
Answer:
Cryogenic fuels are fuels that require storage at extremely low temperatures in order to maintain them in a liquid state. These fuels are used in machinery that operates in space (e.g. rocket ships and satellites) because ordinary fuel cannot be used there due to the very low temperatures often encountered in space, and due to absence of an environment that supports combustion (on Earth, oxygen is abundant in the atmosphere, whereas human-explorable space is a vacuum where oxygen is virtually non-existent).
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