when you light a candle, what kind of a gas it has? the one who has smoke. what is it?

The gas is simply a mixture of vapourised wax and air. When you light the candle, the heat from the burning wick causes the top layer of the candle to melt and the capilary action of the wick fibres causes the liquid wax to be drawn up towards the flame where it burns.

When you blow the candle out, the wick remains smouldering for a short time, warm but not hot enough to burn the wax vapour which comes off as what we call "smoke" (actually a mixture of wax vapour, air and dispersed tiny carbon particles).

Not sure what is causing the coloured flames in the photo. I have never seen that before; it may simply be a photo edited to look that way (with Photoshop or similar).

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