The term "cryogenics" is used to describe refrigeration systems that operate within which temperature range?

Cryogenics refers to the study and application of techniques that involve very low temperatures, typically below -238°F (-150°C), which is close to absolute zero. The correct temperature range for the term "cryogenics" is from about -250°F to -450°F. At these extremely low temperatures, the behavior of materials and gases changes significantly, allowing for unique applications in various fields, including physics and engineering.

Systems operating within this range are utilized for liquefying gases, maintaining superconductivity, and other advanced scientific applications. The other options list temperature ranges that fall above the threshold required to qualify as cryogenic, thus they do not accurately represent this specialized area of study. Understanding the specific temperature ranges helps clarify the applications and technologies used in cryogenics, distinguishing them from conventional refrigeration systems.