Volatile means something changing or changeable. It can refer to: In general: Volatility, a measure of instability In economics: Volatility (finance), a measure of the risk in a financial instrument In chemistry: Volatility (chemistry), a measure of the tendency of a substance to vaporize. It has also been defined as a measure of how readily a substance vaporizes. Volatiles, a group of compounds with low boiling points that are associated with a planet's or moon's crust and/or atmosphere… (More on Volatile)