Answers

2014-06-07T20:58:27+05:30
Maybe because heat rises up and clearly the flame is a source of heat because the coolest part of the flame is on the inside.
or it maybe that
air exerts its pressure upwards.
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2014-06-08T14:00:44+05:30
Actually hot molecules goes upwards and cool molecules downwards.flame consists of hot molecules and therefore the flame appears to be moving upwards.
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