Why are flammable liquids with low boiling points considered hazardous?

Flammable liquids with low boiling points are considered hazardous primarily because they produce large volumes of flammable vapor at relatively low temperatures. When these liquids are exposed to the air, they can rapidly evaporate and create a vapor cloud, which can easily ignite in the presence of an open flame or spark. This characteristic poses significant safety risks, as the vapors can travel considerable distances from the liquid source and can accumulate in low-lying areas, leading to potential flashback or explosion scenarios.

The ability of these liquids to generate flammable vapors at lower temperatures means that they can be hazardous even under conditions that might not seem dangerous for other substances with higher boiling points. Proper safety measures must be taken to handle and store these materials to prevent fire or explosive incidents.