Fire Safety Education Series

The Nature of Fire (Part 4) - Ignition Temperature: When Does Fuel Actually Catch Fire?

**Flash Point, Fire Point, and Auto-Ignition Temperature: Why Some Fuels Ignite More Easily Than Others**

**The Nature of Fire (Part 4)**

Ignition Temperatures

Different materials ignite at different temperatures. This is why some materials catch fire much more easily than others.

Two important ignition temperatures are commonly discussed:

• Kindling (Pilot) Ignition: This occurs at the kindling (or pilot ignition) temperature—the minimum temperature at which a material will ignite when an external ignition source, such as a flame, match, or spark, is present.
  
  
• Auto-Ignition: This occurs at a higher temperature threshold, known as the auto-ignition temperature, where a material ignites spontaneously without any external flame or spark.

Every fuel has a temperature at which it can ignite. Until that point is reached, even the most combustible material cannot sustain a flame. Heat prepares the fuel—but another ingredient is still required to keep the fire alive.

That final ingredient is all around us, yet we rarely think about it.

Up Next:

The Nature of Fire (Part 5) - Oxygen: The Invisible Partner in Every Fire

In the next article, we'll examine why oxygen is essential for combustion, why normal air is just right for sustaining fire, and how changing the oxygen concentration can make a fire weaker, stronger, or impossible to sustain.

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