why does the fire is flow from downward to upward.
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The heated air is less dense than the surrounding cooler air, and so the cooler air "squeezes out" the hot air, which moves upward. As the hot air moves upward, so does some of the still-burning material, resulting in a flame that flickers upward, away from gravity.
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Fire or flame as we see or even if we don't is hot gas and it seems to have an upward flow only because of gravity. The hot gas from fire is lighter than the air around it and thus it goes up. The air around it which is at lower temprature is helddown by gravity wrt the hot gas which rises to the top.
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