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Explain linear expansion of solid....

Explain linear expansion of solid.

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`(i)` The increase in length of a body due to the increase in its temperature is called linear expansion.
`(ii)` In solids, for a small change in temperature `DeltaT`, the fractional change in length is directly proportional to `DeltaT`.


`(DeltaL)/(L)=alpha_(L)DeltaT`
`alpha_(L)=(DeltaL)/(LDeltaT)`
`(iii)` Where, `alpha_(L)=` coefficient of linear expansion.
`DeltaL=` Change in length
`L=` Original length
`DeltaL=` Change in temperature
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