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Answer Posted / edward mahoney
First you must go back to simple chemistry.
What is a fire? It is the combustion of carbon.
Carbon is being oxidised to form carbon dioxide.
This is exothermic, meaning what? It gives off ENERGY.
With A level Physics you learn that an atom with electrons
which has been excited will emit light photons, this is the
visable fire.
The rest of the energy is lost as heat, which will make the
carbon dioxide less dense as anything heated expands and
has a lower density. This lower density causes it to rise.
This is the ONLY reason a fire rises upwards. Ignore the
rubbish above, it isn't correct in the chemical or physical
processes.
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