gaseity; vaporousness; flatulence, flatulency; volatility; aeration, aerifiction., elastic fluid, gas, air, vapor, ether, steam, essence, fume, reek, effluvium, flatus; cloud; ammonia, ammoniacal gas; volatile alkali; vacuum, partial vacuum., [Science of elastic fluids] pneumatics, pneumatostatics; aerostatics, aerodynamics., gasmeter, gasometer; air bladder, swimming bladder, sound (of a fish).

vaporize, evaporate, evanesce, gasify, emit vapor [more]; diffuse.

gaseous, aeriform, etherea, aerial, airy, vaporous, volatile, evaporable, flatulent.