Definition of Cryogen

Babylon English Dictionary
substance which produces low temperatures
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Cryogen Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. a liquid that boils at below -160 C and is used as a refrigerant
(hypernym) refrigerant
(hyponym) liquid nitrogen
Cryogen Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In physics, cryogenics is the study of the production of very low  temperature (below -150 °C, -238 °F or 123 K) and the behavior of materials at those temperatures. A person who studies elements under extremely cold temperature is called a cryogenicist. Rather than the relative temperature scales of Celsius and Fahrenheit, cryogenicists use the absolute temperature scales. These are Kelvin (SI units) or Rankine scale (Imperial & US units).

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