Question

Is the linear expansivity of a material directly proportional to temperature.

Answer 1

Linear Thermal Expansion—Thermal Expansion in One Dimension

The change in length {Δ}L is proportional to length L. The dependence of thermal expansion on temperature, substance, and length is summarized in the equation

L proportional to alpha×LT

where {Δ}L is the change in length L, ΔT is the change in temperature, and \alpha is the coefficient of linear expansion, which varies slightly with temperature.

so it means that yes linear expansion of any material is directly proportional to the temperature

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