Question

why flames always rise upwards​

Answer 1

$\huge\mathfrak\blue{hey!!!!mate}$

Actully the heated air is more dense than surrounding air . So the flame always go upward it is light .

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Answer 2

The pull of gravity draws colder, denser air down to the base of the flame, displacing the hot air, which rises. This convection process feeds fresh oxygen to the fire, which burns until it runs out of fuel. The upward flow of air is what gives a flame its teardrop shape and causes it to flicker.