If a volume of air is warmed, it expands and tends to: cool.
The air expands and takes up more area when heated. The same object gets lighter as it takes up more room. There is warm air As a result, warm air is lighter than cold air. The smoke rises as a result of that.
Air expands as it rises because air pressure decreases as altitude increases. The air cools as a result of this expansion.
The molecules are separating as they heat up and travel more quickly. As a result, air expands when heated and shrinks when it is cooled, like most other things. The air is less dense than the surrounding material because there is more space between the molecules, which causes the heated air to float higher.
Thus, if a volume of air is warmed, it expands and tends to: cool.
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