Question

The linear expansion of a solid depends on

• A. Its original mass
• B. Nature of the material and temperature difference.
• C. The nature of the material only
• D. pressures

Answer 1

Answer: (B)

Nature of the material and temperature difference.

Linear expansion of a solid because of heat depends upon nature of material and the temperature difference. In scientific terms, heat is an internal energy that flows from a system of relatively high temperature to one at a relatively low temperature. The internal energy itself is commonly called "heat." When this internal energy of a solid increases, depending on the nature of material the internal molecular vibration increases. Which in turn is responsible for linear expansion. The linear expansion of a given solid can be calculated according to the formula $L=a{L}_{0}T$. Where L is the change in length, T is the change in temperature, 'a' is the coefficient of linear expansion, and $L_0$ is the original length.