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A wooden splint was slipped through a region of a particular flame in the laboratory and was burnt as in the diagram below.

a) Name the type of flame the splint was slipped through.
b) Explain why the splint was burnt the way is shown in the diagram.

Answer Text:
a).Non-luminous flame;
b).Middle part of the flame is not hot due to unburnt gas while the outer part is hot.