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Rawhiya

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Thermal expansion

Examples:


1. Railway tracks – small gaps are left so they don’t bend in hot weather.

2. Bridges – expansion joints are added to allow safe expansion.

3. Thermometers – the liquid inside rises when heated.

4. Electric wires – they sag in summer because they expand.

5. Metal lids on jars – lids loosen easily if dipped in hot water, as the metal expands.

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