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Cryogenic liquids are those that are maintained at extremely low temperatures, specifically below minus 54°C (minus 130°F). These substances can exist in a liquid state only under conditions of very low temperature and often high pressure. The characteristics of cryogenic liquids include their ability to condense gases, which makes them essential in various applications, such as in medical and industrial fields, where gases need to be stored and transported efficiently.
Flammable liquids, while they can exist at low temperatures, do not specifically refer to the extreme cold required to classify them as cryogenic. Hazardous liquids encompass a broad range of substances that may be dangerous for various reasons, including toxicity, flammability, or reactivity, without directly relating to temperature. Corrosive liquids are those capable of causing damage to living tissue or material surfaces upon contact but do not necessarily correlate with the definition of cryogenic liquids based on temperature criteria.
Thus, the defining characteristic of cryogenic liquids is their existence at very low temperatures, making the correct selection appropriate.