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for example: When we light a candle, the surrounding molecules of air around the flame collides with each other as it becomes hotter and hotter and the density of this hot air molecules tends to go upward. This upward motion of hot air molecules influence the shape of fire because thecold air from the bottom part of the candle moves upward and that determines the shape of fire from down -up. Also this can be explained by air ventillation process. The cold air entering a room tends to go down the floor while the hot air inside the room tends to rise faster exiting the room thereby cooling the room in the process.
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