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Explain linear expansion of solid....

Explain linear expansion of solid.

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(1) When a body is heated or cooled , the length of the body changes due to change in its temperature. The expansion is said to be a linear or longitudinal expansion.

(ii) The ratio of increase in length of a body per degree rise in temperature to its unit length is called as the coefficient of linear expansion.
(iii) SI unit is `K^(-1)`.
(iv) The value of coefficient of linear expansion is different for different materials.
(v) The equation relating the change in length to the length in temperature of a body is given below:
`(DeltaL)/(L_(0)) = alpha_(L)DeltaT`
`DeltaL` - Change in length
`L_(0)`- Original length
`DeltaT` - Change in temperature
`alpha_(L)` -Coefficient of linear expansion.
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