Hi. Heat rises. Does the rising heat from something alight also push the object downwards? Also, something alight must be losing weight due to the combustion of the material. How does this weight loss and down-force combination contribute to the forces acting upon an object on fire?
Usually, you're talking about air circulating near an object. The air around and above the object heats up, expands, and rises. Cool air flows down and in from the sides to replace the hot air that rose up. Not necessarily. Combustion is combining something with oxygen, and that can make the thing heavier in some cases. It's complicated. But you must surely have spent at least a little time watching things burn. What did you observe?
