volatile

Liable to lead to sudden change or violence.

“a volatile situation with troops and rioters eager for a confrontation”

Marked by erratic changeableness in affections or attachments.

“a flirt's volatile affections”

Evaporating readily at normal temperatures and pressures.

“volatile oils”

“volatile solvents”

Tending to vary often or widely.

“volatile stocks”

“volatile emotions”

A volatile substance; a substance that changes readily from solid or liquid to a vapor.

“it was heated to evaporate the volatiles”