What is the definition of flash point?

The definition of flash point refers specifically to the lowest temperature at which the vapor of a lubricant can ignite in air but will not continue to burn once the ignition source is removed. This concept is crucial in understanding the flammability of lubricants and other fluids, especially in industrial and mechanical contexts.

Knowing the flash point helps in assessing safety protocols and handling procedures for lubricants, as it informs users about the conditions under which a lubricant may emit vapors that can ignite. This understanding is critical for maintaining safe working environments and preventing fires or accidents involving flammable materials.

The other potential definitions do not accurately capture the essence of the flash point, since they either describe conditions of combustion (as in the case of ignition and burning) or other characteristics of lubricants that are not related to their flammability.