What qualifies a liquid as flammable?

A liquid is classified as flammable based on its flash point, which is the lowest temperature at which it can produce enough vapor to ignite in the presence of an ignition source. In this context, a liquid that gives off flammable vapors at or below 80°F meets the criteria for being flammable. This is significant because it indicates that the vapors can ignite at relatively low temperatures, making it hazardous under certain conditions.

Understanding flash points helps ensure safety in the handling, storage, and transport of various liquids, particularly in marine environments where flammable vapors can pose serious risks. In contrast to the incorrect options, a liquid that gives off vapors above this temperature does not qualify as flammable because it requires a higher temperature to produce ignitable vapors. Therefore, the focus on an 80°F threshold aligns with established safety classifications for flammable liquids.