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| Superficial Expansion |
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| Expansion in area of a Laminar surface due to heating is known as superficial expansion. |
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| Let a1 = area of a surface |
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| t1 = its initial temperature |
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| a2 = area of the surface after heating |
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| t2 = final temperature |
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| The coefficient of superficial expansion is defined as the ratio of increase in area to its original area for every degree
increase in temperature. |
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| Increase in area = a2-a1 |
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| Rise in temperature = (t2-t1) |
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| Coefficient of superficial expansion (b) |
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