The __________ of a flammable liquid is the lowest temperature at which the liquid will produce sufficient vapor to ignite and continue to burn.

The term that accurately describes the lowest temperature at which a flammable liquid produces enough vapor to ignite and continue to burn is known as the flash point. The flash point is crucial in understanding the safety and handling of flammable liquids, as it indicates the minimum temperature at which the vapors can form an ignitable mixture with air.

When considering the specific characteristics of the other terms:

• Fire point refers to the temperature at which the vapor will not only ignite but also continue to burn for a sustained period. This is typically at a higher temperature than the flash point.

• Ignition temperature, also known as autoignition temperature, is the temperature at which a material can ignite without an external ignition source, and it is often much higher than the flash point.

• Spontaneous combustion point pertains to materials that ignite without a spark or flame due to self-heating and is different from the flash point.

Therefore, the correct answer highlights the significance of the flash point in the context of flammable liquids, emphasizing the importance of understanding this property for safe handling and storage.