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| Expansion of Matter |
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| Matter expands on heating, i.e., solids, liquids and gases expand on heating. Let us consider expansion of solids: |
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| Three types of expansions are considered in case of solids. This classification is done according to the shape of the solids. |
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| When length of a solid (rod) is much greater than its breadth and thickness, linear expansion or expansion in length is considered. |
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| Length of a rod |
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| Length of a rod increases on heating |
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| When a solid is in the form of a Lamina,
its length and breadth increase on heating. Hence, its area also increases.
This is known as superficial expansion. |
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| Area of Laminar body increases on heating |
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| The volume of a solid increases on heating. This is known as cubical expansion. |
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| Let us now consider the three types of expansion in detail. |
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