What Is The Formula To Find The Linear Expansivity Of A Solid?

Linear expansivity of a solid is defined as the increase in length, per unit length per each degree rise in temperature of that particular solid.

=L1-L2\L1(O1-O2)

Linear expansivity of a substance is the fractional change in length/volume/area per unit change in temperature at a given constant pressure.
The formula of linear expansivity of solid is ,

Lf =  Li [1 + a (Change in T)]

where T is temperature and Li is initial length.
And a is constant linear expansivity of the metal.

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The ice and steam points on a thermometer correspond to X and 50mm respectively. A temperature of 60degree celcius corresponds to 52mm on the thermometer. Calculate the value of X

Linear expansivity of a solid can be defined as increase in length per unit length per change in temperature of that subtance

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