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what is meaning coefficient of linear expansion?

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@shriram  Your friends have answered your question correctly.

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@  Jigyassa , Sinidhya Very good! Keep it up!

I would like to add something to it.

Coefficient of linear expansion(α) is given by

 

Where L = length of rod 

ΔL = increase in length

ΔT = increase in temperature.  

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coefficient of linear expansion of a substance is numerically equal to the increase in length of a rod of that substance of unit length when the temperature is increased by 1 degree celsius.

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ANS: The coefficient of linear expansion is the change in length per unit length resulting from a one degree rise in temperature, expressed in degrees. It is also known as linear expansivity.

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