What is the temperature range at which flammable liquids can ignite?

Flammable liquids can ignite at temperatures at or above their flash point. The flash point is the lowest temperature at which the vapor of a liquid can ignite when exposed to an ignition source. This is a critical concept in fire safety, as it indicates the temperature at which a substance can produce sufficient vapor to form an ignitable mixture with air.

Since the question addresses the ignition of flammable liquids, it is essential to recognize that ignition does not typically occur below the flash point, as there isn't enough vapor present to sustain combustion. As such, the concept of being below the flash point inaccurately implies that ignition can happen without adequate vapor production. In contrast, ignition is feasible at and above the flash point because enough flammable vapor is available to ignite in the presence of an ignition source.

Understanding this distinction is vital for anyone dealing with flammable materials, as it informs safe handling and storage practices to mitigate fire risks.