I use an LPG (liquefied petroleum gas) gas stove at home for cooking purposes. I notice that, in the flame, the bottom part is almost always blue but the top has a yellowish-orange color. Why is that?
Edit - There was a suggestion from the community asking me whether an answer regarding the color of a candle flame. I read that and I feel it doesn't quite answer my question because the answer is based on the fact that candle flame consists of glowing soot, whereas here in the case of LPG, there isn't any unburnt carbon (soot) I think because it's a gaseous hydrocarbon fuel (propane and butane) unlike wax in a candle.