a.

1. （液體等）易揮發的
   Gasoline is volatile.

   汽油是易揮發的。

2. 易發作的；爆炸性的
   The situation in that area was tense, dangerous and volatile.

   該地區的局勢緊張、危險，且有一觸即發之勢。

3. 易變的；反覆無常的；輕浮的
4. 活潑的；輕快的
5. 飛逝的；短暫的

adj.

1. (of a substance) easily evaporated at normal temperatures.
2. liable to change rapidly and unpredictably, especially for the worse.
   ▸liable to display rapid changes of emotion.
3. (of a computer's memory) retaining data only as long as there is a power supply connected.

n.