Sat November 26, 2011 By: Vinothini R.

why fire goes upward even though gravitational force acts upon it?

Expert Reply
Sun November 27, 2011
A flame consists of gases so hot they glow yellow, orange, and red. Hot gasses expand and become less dense than the surrounding air. Therefore, the flame is lighter than an equal volume of air.
A flame goes up much as a submerged cork bobs to the water surface when released. The flame is lighter than air and the air’s buoyant force is, therefore, strong enough to push the flame up.
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