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Iron expands thermally due to the increase in kinetic energy of its atoms as temperature rises. When heated, the atoms vibrate more vigorously and move apart, leading to an increase in the material's volume. This thermal expansion occurs in all materials, but the extent of expansion varies depending on the material's properties. In iron, this phenomenon is typically characterized by its coefficient of thermal expansion, which quantifies how much it expands per degree of temperature increase.

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1w ago

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