First, place your tea bag on the foil and light it with the lighter. This causes your tea bag to burn down then suddenly fly up high in the air in ashes. This happens because the air around the fire would grow warm and cold air rushes through the tea bag from the bottom, causing the tea bag to suddenly fly into the air in ashes.
The tea bag then slowly floats down to the ground, although if you put your hand underneath it the ashes will lift up a bit because of your hand’s heat.
In conclusion, the tea bag flies because of the column of hot air rising due to cold air rushing in through the bottom of the tea bag. Once the tea bag is burned down it rises up due to the convection current that the hot and cold air made.
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