Flame

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Definition of Flame

A flame is the visible, gaseous part of a fire. It is caused by a highly exothermic reaction taking place in a thin zone

More About Flame

  • Some flames are hot enough to have ionized gaseous components of sufficient density to be considered plasma
  • A candle flame which has a temperature below 1500 °C produces too low an ion density to be considered plasma
  • Color and temperature of a flame are dependent on the type of fuel involved in the combustion
  • When a lighter is held near a candle flame, the applied heat causes the fuel molecules in the candle wax 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
  • The substances which vaporize during burning, give flames. For example, kerosene oil and molten wax rise through the wick and are vaporized during burning and form flames
  • Charcoal, does not vaporize and does not produce a flame
  • If a glass tube is held near the dark zone of the flame of a candle and a matchstick is brought near the other end of the glass tube, it is observed that the matchstick catches fire
  • When the candle flame is steady, introduce a clean glass plate/slide into the luminous zone of the flame. If it is held with a pair of tongs, it Is observed that a circular blackish ring is formed on the glass plate
  • It indicates the deposition of unburnt carbon particles present in the luminous zone of the flame
  • If a copper wire is held inside a flame for some time, it is observed that the copper wire becomes red-hot
  • Goldsmiths blow the outermost zone of a flame for melting gold and silver