Ember

Embers of coal

A bonfire in rural Australia, with a large number of embers being blown by the wind.

Ember of Charcoal Used for cooking

An ember is a glowing, hot coal made of greatly heated wood, coal, or other carbon-based material that remain after, or sometimes precede, a fire. Embers can glow very hot, sometimes as hot as the fire which created them. They radiate a substantial amount of heat long after the fire has been extinguished, and if not taken care of properly can rekindle a fire that is thought to be completely extinguished and can pose a fire hazard. In order to avoid the danger of accidentally spreading a fire, many campers pour water on the embers or cover them in dirt. In comparison, embers can also be used to relight a fire after it has gone out without the need to rebuild the fire - In a conventional fireplace, a fire can easily be relit up to 12 hours after it goes out, provided that there is enough space for air to circulate between the embers and the introduced fuel.

They are often used for cooking, such as in charcoal barbecues. This is because embers radiate a more constant form of heat, as opposed to an open fire which is constantly changing along with the heat it radiates.

An ember is usually formed when a fire has only partially burnt a piece of fuel, and there is still usable chemical energy in that piece of fuel. Often this happens because the usable chemical energy is so deep into the center that air (specifically oxygen) does not reach it, therefore not causing combustion (carbon-based fuel + O₂ → CO₂ + H₂O + C + other chemicals involved). It continues to stay hot and does not lose its thermal energy quickly because combustion is still happening at a low level. The small yellow, orange and red lights often seen among the embers are actually combustion. There just is not enough combustion happening at one time to create a flame. Once the embers are completely 'burned through', they are not carbon as is commonly believed (carbon burns, and is not normally left behind), but rather various other oxidized minerals like calcium and phosphorus. At that point they are normally called ashes. See: Wood ash for more on the residue that is left.

Embers play a large role in forest fires. Since embers are typically burnt leaves and thus small and light, they can be blown away by the wind. During a large fire, with the right wind conditions, embers can be blown far ahead of the fire front, starting spot fires several kilometres away. One of the initial stages of defending against a bushfire is dubbed the "ember attack", in which embers will bombard the house, starting small fires in wooden structures.^[1]

See also

• Spark, an airborne ember

References

External links

Look up ember in Wiktionary, the free dictionary.

Wikimedia Commons has media related to Embers.

Firelighting
Campfire Bonfire Glossary
Components	Ember Fire triangle Firewood Spark Tinder Wood ash Wood fuel
Topics	Autoignition temperature Combustion Friction fire Minimum ignition energy Smouldering
Early starters	Burning glass (Solar Spark Lighter) Fire piston Fire plough Fire-saw Fire striker Flint Hand drill Bow drill Pump drill
Modern starters	Match Chisquero Black match Electric match Ferrocerium Lighter Blowtorch
Other equipment	Char cloth Feather stick Fire pan Fire pit Fire ring Matchbook Matchbox Punk Tinderbox Torch Chuckmuck
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