Question

What is flame............​

Answer 1

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$\implies$ You should have observed that different materials burn with different flames of different colours. A candle burns with a yellow flame and produces smoke while LPG (Liquified Petroleum Gas) in our kitchen burns with a blue flame.

When a fuel is ignited, it catches fire. The region in which it burns is called the Flame. The colour of the flame depend upon the chemical substances that is burning and the gases released during combustion. It is not necessary that all combustible substances will burn with flame. Some of them catch fire on being ignited but burn without any flame. Only those substances which vaporize on burning produce a flame. For example, when you light a matchstick, wood gas is produced which burns with a yellow flame.

How does the wax of a candle burn? When you light a candle with a matchstick, the wax melts due to heat. The vapour of the wax rises up through the wick and burns when mixed with air. The vapour of wax burns with the yellow flame and produces smoke. Charcoal does not vapourise, it burns only with a glow and does not produce any flame.

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Answer 2

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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. Very hot flames are hot enough to have ionized gaseous components of sufficient density to be considered plasma.

Color and temperature of a flame are dependent on the type of fuel involved in the combustion, as, for example, when a lighter is held to a candle. The applied heat causes the fuel molecules in the candle wax to vaporize (If this process happens in inert atmosphere without oxidizer, it's called pyrolysis). 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 high temperature of the flame causes the vaporized fuel molecules to decompose, forming various incomplete combustion products and free radicals, and these products then react with each other and with the oxidizer involved in the reaction.

Hope it helps!