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Heat and Thermodynamics — Physics STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11PhysicsHeat and Thermodynamics2 Marks
Question
Define coefficient of area expansion? Give its unit.
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Answer

The coefficient of area expansion of a metal sheet is defined as the increase in its surface area per unit original surface area per degree rise in its temperature.
The unit of $\alpha_A$ is ${ }^{\circ} C ^{-1}$ (or) $KT ^{-1}$

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