What is another word for "gaseous"?

Roget's Thesaurus (1911) lists these synonyms for "gaseous": aeration, aerial, aerification, aeriform, aerodynamics, aerostatics, air, airy, alkali, ammonia, ammoniacal, bay, bladder, boil, boiling, bubble, bubbly, chloride, cloud, cohobate, cohobation, cupellation, diffuse, distill, distillation, effervesce, effervescence, effervescent, effluvium, elastic, emit, essence, ether, ethereal, evanesce, evaporable, evaporate, evaporation, exhalation, exhale.