volatility  
noun [ U ] uk/ˌvɒl.əˈtɪl.ə.ti/ us/ˌvɑː.ləˈtɪl.ə.t̬i/
  (CHANGE)         
  波动|(突然)恶化
the quality or state of being likely to change suddenly, especially by becoming worse
  the volatility of the political situation 政治局势的动荡 
 worries about volatility in the economy 关于经济突然恶化的担忧 
 market/price/currency volatility 市场波动/价格波动/货币波动 
  易怒
the quality of being likely to become angry suddenly
  There are many stories about his volatility and volcanic temper. 有些故事是关于他易怒易爆脾气的。 
 - More examples
 - Extreme market volatility would prove disastrous for producers and consumers alike.
 - Price volatility should not affect consumer bills.
 - Currency volatility is putting jobs at risk.
 - His volatility and paranoia caused problems for all he encountered.
 - He was on medication to calm his volatility.
 
  (OF SUBSTANCE)      
 chemistry specialized挥发性 
the quality of changing easily into a gas
  The higher the vapour pressure of a liquid at a given temperature, the higher the volatility. 一种液体在特定温度下的蒸汽压越高,挥发性也就越高。 
 - More examples
 - Volatility is what makes flavors into aromas that we experience in our noses.
 - Liquids of varying volatility can be separated.
 
See: volatile