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. The small yellow, orange and red lights often seen among the embers are actually combustion the combustion is just not happening at a fast enough rate to create a flame. It continues to stay hot and does not lose its thermal energy quickly because combustion is still happening at a low level. 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 + O 2 → CO 2 + H 2O + C + other chemicals involved). This is because embers radiate a more consistent form of heat, as opposed to an open fire, which is constantly changing along with the heat it radiates.Īn ember is formed when a fire has only partially burnt a piece of fuel, and there is still usable chemical energy in that piece of fuel. They are often used for cooking, such as in charcoal barbecues. Alternatively, embers can 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. In order to avoid the danger of accidentally spreading a fire, many campers pour water on the embers or cover them in dirt. 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.
Embers are, in some cases, as hot as the fire which created them. Embers (hot coals) can exist within, remain after, or sometimes precede, a fire. An ember, also called a hot coal, is a hot lump of smouldering solid fuel, typically glowing, composed of greatly heated wood, coal, or other carbon-based material.
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