What type of gases are categorized as liquefied cryogenics?

Liquefied cryogenics are specifically defined as gases that exist in a partially liquid state when under pressure. This phenomenon occurs because certain gases, when compressed and cooled, can transition between gas and liquid phases, allowing them to coexist in both forms. This characteristic is crucial in applications such as medical gas supply systems, where the ability to store gases in a denser liquid state provides more efficient storage and delivery options.

In contrast, gases at room temperature without pressure do not reach the liquid state at standard temperatures and pressures, and therefore, cannot be classified as liquefied cryogenics. Similarly, without any pressure applied, gases cannot become liquefied; they remain in a gaseous state. Non-flammability relates to a specific property of certain gases but does not pertain to their liquefied state under pressure. Therefore, the correct classification of liquefied cryogenics aligns directly with gases that are partially liquid under pressure.