A substance used to produce very low temperatures.
- The first cryogens were liquid air and compressed carbon dioxide snow.
- After all, a superconductor that is both easy to process and can be cooled using electrical refrigerators, rather than messy cryogens, would find many applications.
- They also recommended that a prototype using hydrogen as a combined cryogen and form of energy transport be designed, built and tested at one of the national laboratories.
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