What is the minimum temperature at which a liquid can generate an ignitable vapor?

The correct answer is the flash point, which is defined as the minimum temperature at which a liquid can produce enough vapor to form an ignitable mixture with air. When the temperature of the liquid reaches this point, the vapor emitted can ignite in the presence of an adequate ignition source. Understanding the flash point is crucial for fire safety as it helps assess the risks associated with handling and storing flammable liquids.

The flash point is distinct from other terms; the fire point is the temperature at which a liquid can sustain combustion once ignited, which is usually higher than the flash point. The lower explosive limit refers to the minimum concentration of vapor in air that can ignite, while ignition temperature is the temperature required to ignite a substance without an external ignition source.