What is the temperature at which a liquid fuel gives off sufficient vapor such that when an ignition source is present the vapors will ignite?

The temperature at which a liquid fuel releases enough vapor to ignite in the presence of an ignition source is known as the flash point. This concept is crucial in hazardous materials operations, particularly when dealing with flammable liquids, as it indicates the minimum temperature at which the liquid can produce a flammable mixture in the air.

Understanding flash point is essential for safely handling and storing hazardous materials. When the temperature of the liquid reaches the flash point, vapors form and, if an ignition source is present, these vapors can catch fire, leading to potential fires or explosions.

The other terms provided do not fit this definition. The boiling point refers to the temperature at which a liquid turns to vapor throughout the liquid, while the ignition point often describes the temperature at which a substance starts to burn independently without an external ignition source. The freezing point is the temperature at which a liquid solidifies, which is not relevant in the context of igniting vapors.