flash point -
The lowest temperature at which a liquid can form an ignitable mixture in air near the surface of the liquid.
flash point -
A hotspot; a dangerous place of violent political unrest.
Wikipedia
The flash point of a volatile liquid is the lowest temperature at which it can vaporize to form an ignitable mixture in air. Measuring a liquid's flash point requires an ignition source. At the flash point, the vapor may cease to burn when the source of ignition is removed.
OmegaWiki Dictionary
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flash point The lowest temperature at which a volatile material can vaporize to form an ignitable mixture in air.