A situation that is volatile is likely to change suddenly and unexpectedly.
例句
There have been riots before and the situation is volatile...以前曾發生過暴亂，現在局勢不太穩定。The international oil markets have been highly volatile since the early 1970s...從20世紀70年代初開始，國際石油市場就一直很不穩定。
ADJ-GRADED
（人）易變的，情緒無常性的
If someone is volatile, their mood often changes quickly.
例句
He accompanied the volatile actress to Hollywood the following year...第二年他陪著這位情緒無常的女演員去了好萊塢。He has a volatile temper.他脾氣反復無常。
ADJ-GRADED
（液體等物質）易揮發的，易發散的
A volatile liquid or substance is one that will quickly change into a gas.
例句
It's thought that the blast occurred when volatile chemicals exploded.人們認為，易揮發的化學物質爆炸時產生了沖擊波。
英英詞典釋義
Noun
1. the property of changing readily from a solid or liquid to a vapor
2. the trait of being unpredictably irresolute;
"the volatility of the market drove many investors away"