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When I hold a flame above a flame the one on top flickers and waves as if its about to go out. What is the cause of this?

2 Answers2

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Flame produces hot gas flowing upwards and blowing the flame on top.

user115350
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  • That explains the waving, but not necessarily the flame flickering as if its about to go out. The truth is likely a combination of yours and @Shua's. – Neil May 31 '16 at 07:05
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Likely, the top flame is being robbed of its oxygen by the bottom flame.