The temperature at which a liquid fuel, once ignited, will continue to burn is the:

• A. fire point.
• B. vapor temperature.
• C. boiling point.
• D. flash point.

Answer: (A)

When a flammable liquid is heated, its vapors form and can ignite. The flash point is the temperature at which those vapors can ignite briefly, but the flame may go out. The fire point is higher and is the temperature at which the flame will continue to burn after ignition because enough heat is present to keep generating vapors and sustain combustion. The boiling point isn’t about ignition or ongoing burning, and “vapor temperature” isn’t a standard term used in this context. Therefore, the temperature at which a liquid fuel, once ignited, will continue to burn is the fire point.