1. Linear expansion : It is the increase in leng of a solid on heating. Suppose L is original length of alid rod. Let Delta*L be a small increase in length of rod when its temperature is raised by a small amou Delta*T It is found that Delta*L & L and Delta*L & Delta*T Delta*L & Delta*T ..
or, Delta*L = alpha*L*Delta*T
Change in length
AL LAT α = = Original length x change in temperatun
Where, a is a constant of proportionality and called coefficient of linear expansion. The value of depends on nature of material of solid. It is measure in ^ C ^ - 1 or K ^ - 1
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