Question

4. Describe one example each of expansion in solids, liquids, and gases.

5. Describe one example each of contraction in solids, liquids, and gases.
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Answer 1

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Describe one example each of expansion in solids, liquids, and gases ?

➜ Substances expand (increase in size) when they get warmer, and they contract (decrease in size) when they get cooler. This property can be useful.

For example:

• Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.
• Metal parts can be fitted together without welding, using shrink fitting.

Describe one example each of contraction in solids, liquids, and gases?

➜ The expansion and contraction of materials can also cause problems.

For example, bridges expand in the summer heat and need special joints to stop them bending out of shape.

Answer 2

Answer:

Substances expand (increase in size) when they get warmer, and they contract (decrease in size) when they get cooler. This property can be useful.

Thermometers work because the liquid inside them expands and rises up the tube when it gets hotter.

Metal parts can be fitted together without welding, using shrink fitting.

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