Volatile

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Volatile is a word meaning, roughly, "temporary" or "fickle". It has specific meanings in several fields:

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In economics:

Volatility is a measure of the risk in a financial instrument

In chemistry, a volatile substance evaporates at a relatively low temperature:

Volatile organic compounds evaporate at normal temperatures and pressures
Volatile anaesthetics are a class of anaesthetics which evaporate easily
Volatile substance abuse is the abuse of household inhalants containing volatile compounds
Volatile oil is another name for "essential oil"
Volatile acidity is an unacceptably high level of acid or vinegar, in winemaking

In computer science:

Volatile variables can be changed by external processes
Volatile memory holds items in memory only while power is on

In geology:

Volatiles are the volatile compounds of magma (mostly water vapor), which plays an important part in the strength and appearance of a volcano.

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