evaporating rapidly; passing off readily in the form of vapor

Acetone is a volatile solvent.

tending or threatening to break out into open violence; explosive

a volatile political situation.

changeable; mercurial; flighty

a volatile disposition.

(of prices, values, etc.) tending to fluctuate sharply and regularly

volatile market conditions.

fleeting; transient

volatile beauty.

Computers . of or pertaining to storage that does not retain data when electrical power is turned off or fails.

able to fly or flying.

a volatile substance, as a gas or solvent.