Question

When temperature increses then coefficient of linear expasio?

Answer 1

When something is heated or cooled, its length changes by an amount proportional to the original length and the change in temperature:  Even sidewalks are built accounting for thermal expansion. Holes expand and contract the same way as the material around them.

Answer 2

The coefficient of thermal expansion describes how the size of an object changes with a change in temperature. Specifically, it measures the fractional change in size per degree change in temperature at a constant pressure.