What is defined as nonliquefied compressed gases?

Nonliquefied compressed gases are defined as those that are entirely gaseous at a standard reference temperature (68°F) when in a charged state. This means that, even under pressure, these gases do not have any liquid phase at this temperature. This characteristic is important in understanding how these gases behave in various applications, particularly in medical settings. Knowing that these gases remain in a gaseous state at commonly encountered temperatures helps in their safe handling and storage, making option B the correct choice.

The other choices describe properties that either involve the presence of a liquid or solid phase, which do not align with the definition of nonliquefied compressed gases. For instance, gases that are partially liquid under pressure refer to liquefied gases, and gases in solution with a solvent indicate a different chemical state, while solidified gases at room temperature would not fit the definition of gases at all. These distinctions highlight the unique properties of nonliquefied compressed gases as crucial for safe use in medical applications.