When air is heated, it expands, becomes lighter and goes up. Cold air is denser and heavy. That is why it tends to sink down. Then why as we go up temperature decreases?
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Explanation:
As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.
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