What is the fire point?

What is the fire point?

• A. The lowest temperature at which a liquid will produce enough vapor to ignite and sustain a continuous fire
• B. The temperature at which a liquid begins to boil
• C. The temperature at which a solid will sustain combustion
• D. The auto-ignition temperature of the liquid

Answer: (A)

Fire point is the temperature at which a liquid’s vapors are produced in enough quantity to ignite and keep burning with an ignition source present. This means you need a little more heat than the point where vapor can briefly ignite, so the flame can be sustained. The option that fits this best describes the lowest temperature at which the liquid will produce enough vapor to ignite and maintain a continuous fire. The boiling point is simply where the liquid boils, not about ignition. Auto-ignition temperature is the temperature at which the liquid will ignite on its own without any flame or spark, which is a different concept. For solids, ignition behavior is described differently, not by the liquid fire point.