Do you know why Candle flame is yellow at the top?

Just beyond the white part of the Candle flame is a cap of yellow and orange.

Why does the flame turn from white to yellow and orange at the top?

This has a relationship with why the candle flame points upward. Why does the candle flame point upward? Since hot air is lighter is overlaps cold air and ascents whilst cold air descents or sinks , This is because cold air is more heavy than cold air. As the hot air inside a candle flame rises, the top of the flame becomes cooler. Why? Because the top of the flame is further from the wick where all the gas is evaporating and igniting. As the flame loses heat, it can no longer heat the carbon soot particles white hot, and we begin to see the yellow flame again containing the cooler burning soot. We now have another reason to explain how we were able to relight the candle wick. Right above the wick is unburned soot being carried upward by the hot air. A lighted match can relight that soot.

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