Gas Bunsen
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why is the innermost unburned gas zone the hottest in a bunsen burner?
Erm? It isn't! As you say it is unburned .. ie cold! The hottest point is the tip of the blue cone on the bunsen flame with the air hole open.
You can test this by suspending an unburnt match with wire just below the head. Put it in the chimney of the bunsen so that the match head will be entirely within that innermost cone and light the bunsen with the air hole open. If you have positioned it carefully, the match head will sit unburnt there .. because it is cold!
