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Wood or charcoal fires and lots of forced air from bellows can heat ore above the melting point of iron (1811°C) .
Yes, ANY electrical item can catch fire if the cord or internal wires are damaged.
Grease Fires!
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The advantages of gel fires over log fires is the lack of smoke or smell. Similarly, gel fires can be a cheaper alternative and are slightly safer than log fires.
Traces of charcoal in the soil can often mean that sometime in the past someone has built a fire there, however it is also important to remember that not all fires are man made and that some charcoal may just be traces left from natural fires. Charcoal can provide a reasonable material for carbon dating if found in an archaeological context and there are no better materials to date.
Just open fires
No. Charcoal is made up of mostly carbon atoms which are not arranged in a crystal lattice. Diamond and graphite are examples of carbon atoms arranged in a lattice. Charcoal has been created from fires for millions of years and can be in rocks.
Heating and Cooling
You could end up killing yourself. Burning creates large amounts of carbon monoxide. Carbon monoxide in large quantities is fatal to animals and has killed thousands. it could also block up your lungs and give you a slow pain full death
Charcoal can exist in wide range of temperatures. When not burning, it is room temperature. When burning, it gets very hot. But even then, the temperature can vary quite a bit. Not all fires are equally hot.
people used to use coal fires, and gas and electric fires have been round for years and years, but coal fires was the prefered method
Burning, heating and cooking. Very much the same as today.
In some areas dried animal waste is used for cooking and heating.
Whenever you like. Fireplaces are used for social fires as well as heating.
inside fires
No the coal will turn in to ashes and it is made to make long lasting fires.