if a substance is heated or cooled the linear expansion occurs along the axis of
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So, if the substance is heated then expansion occurs and the substance's dimensions increase in both x and y axis directions. And when the substance is cooled, then contraction occurs and the substance's dimensions decrease in both x and y axis directions.
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The linear expansion of a material is the increase of the length of that material due to the heat transferring process. Now,the linear expansion will occur along one axis (X or Y) at a time because if the linear axis occurs along both the axis (X and Y) at the same time,then the superficial expansion will take place.
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