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WHY DEOS A FLAME GOES UPWARDS?
The fuel vaporizes,and the vapors burn. Since the vapors are hot, they radiate visible light. Since the air around them is hot, there is an updraft, so the hot material travels upwards.

 To be more specific,When something burns, the chemical reactions that are occurring release heat. The heat warms the air in and around the fire. Warm air rises.When the warm air in and around the fire rises upward, more air flows toward the fire to replace the part that went up. The inflowing air comes from all directions -- from around the sides and from under the burning material. This airflow tends to confine the flames and the flame rises up.


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