What is another word for "volatile"?

Roget's Thesaurus (1911) lists these synonyms for "volatile": aeration, aerial, aerification, aeriform, aerodynamics, aerostatics, air, airy, alkali, ammonia, ammoniacal, and, arbitrary, astatic, balloon, barm, bay, bladder, blow, boil, boiling, boutade, brain, bubble, bubbly, buoy, buoyancy, buoyant, camel, capriccio, caprice, capricious, captious, chase, chloride, cloud, cobweb, cohobate, cohobation, cold.