(a) What do you understand by thermal expansion of a substance? [1 Mark]

(b) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle. Explain why? [1 Mark]

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Solution

(a) The tendency of a matter to change its shape, volume and area in response to change in temperature is called thermal expansion. [1 Mark]

(b) When the hot water is poured over the neck of the bottle, it expands. As a result the stopper gets loosened and can be removed easily. [1 Mark]

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Similar questions

Explain the following:

(a) The telephone wires break in winter.

(b) Iron rims are heated before they are fixed on the wooden wheels.

(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

(e) A cement floor is laid in small pieces with gaps in between.

What do you understand by thermal expansion of a substance?

Explain the following : 1.telephone wires sag in summer

2.iron rims are heated before they are fixed on wooden wheels

3. The are left between the successive rails on a railway track

4. A cement floor is laid in small pieces with gaps in between

5. A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle

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