Unit of coefficient of linear expansion

K^{- 1}

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N^{- 1}

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J^{- 1}

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S^{- 1}

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Solution

The correct option is A $K^{- 1}$
Thermal expansion refers to a fractional change in size of a material in response to a change in temperature. For most materials, over small temperature ranges, these fractional changes… uses the SI unit inverse kelvin $(K^{- 1})$ or the equivalent acceptable non SI unit inverse degree Celsius
$(C^{- 1})$ .

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