Question

Why fire acts against the gravity?
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Answer 1

Answer:

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Explanation:

Here on Earth, when a flame burns, it heats the surrounding atmosphere, causing the air to expand and become less dense. The pull of gravity draws colder, denser air down to the base of the flame, displacing the hot air, which rises. ... Without gravity, hot air expands but doesn't move upward.

Answer 2

Answer:

Gravity is a Force and we know that -

F = ma, where F is force, a is acceleration,i.e, acceleration due to gravity in this case and m is mass .

As fire has negligible mass so F = 0 × a = 0

So gravity do not apply any force on fire so it rises upwards