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A flame (from Latin flamma) is the visible (light-emitting), gaseous part of a fire. It is caused by a highly exothermic reaction taking place in a thin zone. Color and temperature of a flame are dependent on the type of fuel involved in the combustion. In a candle the applied heat causes the fuel molecules in the candle wick to vaporize. In this state they can then readily react with oxygen in the air, which gives off enough heat in the subsequent exothermic reaction to vaporize yet more fuel, thus sustaining a consistent flame.
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