Elements of Fire

Fire occurs whenever combustible fuel in the presence of oxygen at an extremely high temperature becomes gas. Flames are the visual indicator of the heated gas. Fire can also occur from lower-temperature sources. Over time, combustible materials such as smoldering embers can reach their ignition temperature.

The Fire Triangle

The fire triangle is a simple way of understanding the elements of fire. The sides of the triangle represent the interdependent ingredients needed for fire: heat, fuel and oxygen.

The fire triangle

#SmokeyBear75

@smokey_bear 14 hours ago
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#SmokeyBear75

Remember, I'm counting on #OnlyYou to do your part so that wildfires don't spark! Visit https://t.co/rI2GCmqjFA for… https://t.co/72vRTacMZh

@smokey_bear 14 hours ago

In 2017,
88% of wildfires were caused by humans.


(Source: nifc.gov)