Noun
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a volatile substance
a substance that changes readily from solid or liquid to a vapor
"it was heated to evaporate the volatiles"
Adjective
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tending to vary often or widely
"volatile stocks"
"volatile emotions"
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marked by erratic changeableness in affections or attachments
"fickle friends"
"a flirt's volatile affections"
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liable to lead to sudden change or violence
"an explosive issue"
"a volatile situation with troops and rioters eager for a confrontation"
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evaporating readily at normal temperatures and pressures
"volatile oils"
"volatile solvents"