What is the nature of graph between length and temperature of a heated metal?

The graph between the length of a heated metal and its temperature typically exhibits a linear relationship, demonstrating thermal expansion. As the temperature increases, the length of the metal also increases due to the increased kinetic energy of the atoms, causing them to move further apart. This relationship is generally described by the linear expansion formula, which states that the change in length is proportional to the change in temperature. However, this linearity holds true only within a certain temperature range for most materials.