inconstant likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare
chemical science,
chemistry the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
volatile -
tending to vary often or widely; "volatile stocks"; "volatile emotions"
changeful,
changeable such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices"
volatile -
marked by erratic changeableness in affections or attachments; "fickle friends"; "a flirt's volatile affections"
inconstant likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare
volatile -
liable to lead to sudden change or violence; "an explosive issue"; "a volatile situation with troops and rioters eager for a confrontation"