名詞 volatile:

1. a volatile substance; a substance that changes readily from solid or liquid to a vapor

形容詞 volatile:

1. evaporating readily at normal temperatures and pressures
2. liable to lead to sudden change or violence
   同義詞：explosive
3. marked by erratic changeableness in affections or attachments
   同義詞：fickle
4. tending to vary often or widely

1. Any of several highly volatile, flammable liquid mixtures of hydrocarbons distilled from petroleum, coal tar, and natural gas and used as fuel, as solvents, and in making various chemicals.
   石腦油一種高度揮發(fā)性的易燃液態(tài)碳?xì)浠衔锘旌衔铮瑥氖?、煤焦油和天然氣中提煉出?lái)，并用作石油、溶劑和制造各種化合物中
2. He has a highly volatile personality.
   他有著反復(fù)無(wú)常的個(gè)性。
3. The volatile political situation in Singapore upset the people.
   動(dòng)蕩不定的新加坡政局使人民感到不安。
4. Petrol is volatile.
   汽油容易揮發(fā)。

vol.a.tile

adj.（形容詞）
Chemistry
【化學(xué)】
Evaporating readily at normal temperatures and pressures.
易揮發(fā)的：在正常溫度和壓力下易揮發(fā)的
That can be readily vaporized.
易蒸發(fā)的

Tending to vary often or widely, as in price:
易波動(dòng)的，不穩(wěn)定的：易于經(jīng)?；虼蠓茸兓模鐑r(jià)格：
例句：
the ups and downs of volatile stocks.
易波動(dòng)的股票沉浮

Inconstant; fickle:
易變的，多變的：
例句：
a flirt`s volatile affections.
浪蕩子多變的愛(ài)情

Lighthearted; flighty:
活潑的，輕快的：
例句：
in a volatile mood.
輕快的心情

Ephemeral; fleeting.
短暫的，易逝的
Tending to violence; explosive:
易爆發(fā)的；爆炸性的：
例句：
a volatile situation with troops and rioters eager for a confrontation.
軍隊(duì)和暴民間爆炸性對(duì)立的局勢(shì)

Flying or capable of flying; volant.
飛行的，能飛的；會(huì)飛的

來(lái)源：
French
法語(yǔ)
from Old French
源自 古法語(yǔ)
from Latin vol3tilis [flying]
源自 拉丁語(yǔ) vol3tilis [飛的]
from vol3tus [past participle of] vol3re [to fly]
源自 vol3tus [] vol3re的過(guò)去分詞 [飛]

【引伸】
vol.atile
n.（名詞）
vol.atil.ity