(a.) Capable of being vaporized into vapor.

adrift afloat agitable airy alternating amorphous birdbrained birdwitted bouncy brittle bubbly buoyant capricious changeable changeful charged coquettish corruptible deciduous desultory deviable dizzy downy dying eccentric edgy effervescent ephemeral erratic eruptive ethereal evanescent evaporable evaporative expansive explosive faddish fading fast and loose featherbrained feathery fickle fitful fleeting flickering flighty flippant flirtatious flitting fluctuating fluffy fly-by-night flying foamy fragile frail freakish frivolous frothy fugacious fugitive giddy gossamery hair-trigger impermanent impetuous imponderous impulsive inconsistent inconstant indecisive infirm insubstantial irregular irresolute irresponsible leger light light as air light-minded lighter than vanity lubricious mazy mercurial momentary moody mortal mousse mutable nondurable nonpermanent passing perishable protean quicksilver rambling resilient restless roving scatterbrained sensitive shallow shallow-headed shallow-minded shallow-pated shallow-witted shapeless shifting shifty short-lived shuffling skittery skittish souffle spasmodic spineless startlish superficial temperamental temporal temporary tense ticklish toying transient transitive transitory unaccountable uncertain uncontrolled undependable undisciplined undurable unenduring unfixed unheavy unpredictable unprofound unreliable unrestrained unsettled unstable unstable as water unstaid unsteadfast unsteady vacillating vagrant vaporable vaporescent vaporizable vaporizing variable versatile vicissitudinary vicissitudinous volatilizable wandering wanton wavering wavery wavy wayward weightless whimsical wishy-washy yeasty