Lack of oxygen and/or material to burn.
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A candle goes out when there is not enough oxygen reaching the flame to sustain combustion. This can happen if the candle is in a closed environment or if the wick gets too short. Additionally, external factors like a breeze blowing out the flame can also cause a candle to go out.
A person that makes candles is called a chandler.
wax do not freeze on top of the candle because the heat on top of the candle makes it melt and as we know heat makes solid melt.
A candle burns for a long time when it contains a high concentration of wax, which is the fuel for the flame. Additionally, factors like the size and quality of the wick, as well as the environment in which the candle is burning, can also impact its burn time.
If there is no oxygen, a burning candle will not be able to sustain the combustion process since oxygen is needed for the flame to continue burning. The candle will eventually go out in the absence of oxygen.
A scented candle typically burns slightly faster than an unscented candle due to the added fragrance oils, which can impact the burning process. However, the difference in burn time is usually not significant.