flash point

The flash point of a liquid is the lowest temperature at which it emits enough vapor to ignite temporarily when exposed to a flame or spark. It indicates how easily the liquid can catch fire; a lower flash point means the substance can ignite at relatively cooler temperatures, while a higher flash point suggests it needs to be hotter to ignite. This property helps assess the flammability risk of liquids like fuels, solvents, and chemicals, guiding safe handling, storage, and transportation decisions.