Question

Why doesn't gravity act on fire flame...???​

Answer 1

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.

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Answer 2

Answer:

Short answer: 

The higher the gravity, the more 'teardrop' shaped a flame will be, and the less gravity, the more spherical.

Explanation:

Long answer:

To answer your question with a picture, check this out - the candle on the left is on earth, but the one on right is in space. Since there isn't a preferred direction (on earth is given by the direction of gravity), the flame in space remains spherically symmetric and the heat diffuses away radially. On the earth, the hot air can rise, which produces the familiar flame shape.

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