define coefficient of linear expansion of solid. write it's unit
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The coefficient of linear expansion is the change in length of a specimen one unit long when its temperature is changed by one degree (see linear expansion). ... A metal such as lead which has a low melting point and is relatively easily compressed, expands a great deal for a given rise in temperature.
The SI unit of coefficient of linear expansion can be expressed as °C-1 or °K-1
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