new word in my dictionary!

vol‧a‧tile  /ˈvɒlətl, -tɪl or, especially Brit., -ˌtaɪl/ Pronunciation Key - Show Spelled Pronunciation[vol-uh-tl, -til or, especially Brit., -tahyl] Pronunciation Key - Show IPA Pronunciation
–adjective

1.	evaporating rapidly; passing off readily in the form of vapor: Acetone is a volatile solvent.