What describes compressed gases in solution?

The correct choice identifies compressed gases in solution as nonliquefied gases that are dissolved in a solvent. This definition highlights the key characteristic of these gases — they maintain their gaseous state while being mixed with another substance, typically a liquid. The process involves the gas molecules dispersing uniformly within the solvent, leading to a solution where gas properties remain intact.

In contrast, the other choices do not accurately define compressed gases in solution. The first option incorrectly centers on solid forms, which does not apply to gases in solution. The third option suggests that these gases exist solely as liquids, which is a misunderstanding, as the focus is on their gaseous state even when dissolved. Lastly, the fourth option addresses mixtures of compressed air rather than the specific nature of gases dissolved in a solvent.