Expansion in .....Of a solid on heating is called superficial expansion
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Thermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature. ... The relative expansion (also called strain) divided by the change in temperature is called the material's coefficient of thermal expansion and generally varies with temperature.
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When solid is heated it expands in all directions i.e. length, area and volume. The increase in area of a particular solid on heating is called superficial expansion.
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area
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