Due to gravity
Yes gravity plays a major role for burning fire upward.
When the candle is burnt, the fire (i.e. hot air) which has more gravity than the cool air, obviously more gravity substance remains downwards & less gravity fire will be at top, so it looks like fire is burning upwards..
When the candle is burnt, the fire (i.e. hot air) which has more gravity than the cool air, obviously more gravity substance remains downwards & less gravity fire will be at top, so it looks like fire is burning upwards..
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