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Thermal Physics

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1. Explain what you mean by unusual expansion of liquid (water)

2. Explain how a bimetalic strip is used in an electric iron and explain how it helps to control the temperature of iron.

3. Thermal expansion can be a problem, small gaps are left in railway lines and in bridges, explain in detail why the gaps are needed.

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1. The unusual expansion of water is this: at temperatures between 0 to 4 degrees Celsius, water is contracting instead of expanding when temperature increases. This is because of the structure of water molecule. When water is in the form of an ice, which is below 0 degrees Celsius, there are open spaces which are unoccupied by water molecules. As the temperature increases wherein ice becomes water, the water molecules occupy those open spaces and thus ...

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