Question

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What is meant by saying that 'air expands on heating'?
Why does hot air (or warm air) rise upwards?
Explain why, smoke always rises up.​

Answer 1

$\sf\pink{1)}$ $\huge\mathfrak\pink{Question}$

What is meant by saying that 'air expands on heating'?

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$\huge\mathfrak\pink{Answer}$

It is because the particles of air on becoming warm, move away from each other and take up more space. So we can say that air on becoming hot occupies more space. Since the particles move away from each other, the air becomes less dense and lighter in weight.

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$\sf\pink{2)}$ $\huge\mathfrak\pink{Question}$

Why does hot air (or warm air) rise upwards?

Explain why, smoke always rises up.

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$\huge\mathfrak\pink{Answer}$

Smoke always rises up because it is less denser than air. It is because smoke is lighter than air . A fire makes things hot. Therefore the temperature of smoke is higher than th atmosphere and as hot air rises up smoke too rises into the air.

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Answer 2

Answer:

It is because the particles of air on becoming warm, move away from each other and take up more space. So... air on becoming hot occupies more space. Thus, the air becomes denser and lighter in weight. Smoke is lighter than air, this is why it rises up.

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