Warm air rises because it is,
a) more dense than cool air.
b) equally dense than cool air
c) less dense than cool air
engliskevin9:
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water. This floating effect in a less dense medium is called a buoyant force or a displacement force.
Answer: C.
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Answer:
less dense than cool air
Explanation:
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Warm air rises because it is less dense than cool air. (option c)
- When air is heated, the molecules comprising the air also get heated up and as a result, they start vibrating at a faster speed and thus acquire higher kinetic energy.
- The more, they get heated up, the more they speed up, and thus, they expand and acquire large volumes and become less dense.
- Thus, warm air being less dense than cool air rises above the cool air.
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