Fire point is defined as the temperature at which a liquid will continue to burn after ignition. Which option matches this definition?

Fire point is defined as the temperature at which a liquid will continue to burn after ignition. Which option matches this definition?

• A. The temperature at which a liquid will continue to burn after ignition
• B. The temperature at which vapors ignite
• C. The temperature at which the liquid boils
• D. The temperature at which ignition spontaneously occurs

Answer: (A)

Fire point is the threshold where the vapors given off by a heated liquid will keep burning after the ignition source is removed, meaning the flame becomes self-sustaining. This is higher than the flash point, which is simply the lowest temperature at which vapors can momentarily ignite but won’t necessarily continue burning. It’s not the boiling point, which is when the liquid turns into vapor through vaporization, nor the autoignition temperature, which is the temperature at which a material will ignite without any external flame. So the statement describing a liquid continuing to burn after ignition matches the fire point.

Fire point is the threshold where the vapors given off by a heated liquid will keep burning after the ignition source is removed, meaning the flame becomes self-sustaining. This is higher than the flash point, which is simply the lowest temperature at which vapors can momentarily ignite but won’t necessarily continue burning. It’s not the boiling point, which is when the liquid turns into vapor through vaporization, nor the autoignition temperature, which is the temperature at which a material will ignite without any external flame. So the statement describing a liquid continuing to burn after ignition matches the fire point.