What is a "cryogenic" gas?

A cryogenic gas refers to gases that are stored at very low temperatures, typically below -150 degrees Celsius (-238 degrees Fahrenheit), to maintain them in a liquid state. This state is essential for various industrial and scientific applications, as liquefied gases occupy significantly less volume than their gaseous forms, making transport and storage more efficient. For example, liquid nitrogen, a common cryogenic gas, is utilized in applications such as cryopreservation and superconductivity.

The characteristics of cryogenic gases make them crucial in fields like cryogenics and aerospace. Understanding the properties of these gases, including the extreme temperatures at which they are kept, helps ensure safe handling and utilization in various processes. This distinction from other gas types is important in contexts where safety protocols must be observed due to risks associated with temperature extremes.