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Ntstanch
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http://imgur.com/gallery/VtWhm - I've been trying this ever since I saw this .gif and it works. No idea why. Can anyone help?
A candle stays lit because of the heat of the flame. The heat melts the wax near the wick and the liquid wax is drawn up the wick by capillary action. The liquid wax is then vaporized by the heat of the flame and it is the vapor that burns.
When you blow out a candle, the smoke is created by the unburned particles of wax that are still in the air. The smoke is created by the carbon particles in the candle's wick that are not completely burned up. These particles are still hot and they give off the smoke that you see.
When you relight a candle using its smoke, you are igniting the unburned particles of wax in the smoke. These particles are still hot and flammable, so when you bring a flame close to them, they ignite and start a new flame. This process is called "reignition."
If the candle is not able to relight using its smoke, it could be because the smoke has already cooled down and the particles are no longer hot enough to reignite. It could also be because the smoke is being blown away by air currents, preventing it from reaching the flame. Additionally, if the candle was recently blown out, there may not be enough smoke to relight the candle.
Relighting a candle using its smoke is generally safe, as long as you take proper precautions. Make sure to hold the candle steady and keep your fingers away from the flame. Also, be cautious of any objects or materials that may be close to the candle and could catch fire. It's always a good idea to have a fire extinguisher nearby, just in case.