From HomoExcelsior

1. Evaporating readily at normal temperatures and pressures. 2. That can be readily vaporized. 3. the ups and downs of volatile stocks. 4. a flirt's volatile affections. 5. in a volatile mood. 6. Ephemeral; fleeting. 7. a volatile situation with troops and rioters eager for a confrontation. 8. Flying or capable of flying; volant.

---