# Illustration Thermal expansion of a metallic rod

Get illustration

Share — copy and redistribute the material in any medium or format

Adapt — remix, transform, and build upon the material for any purpose, even commercially.

Sharing and adapting of the illustration is allowed with indication of the link to the illustration.

A metal rod of length $$l_0$$ with initial temperature $$T_0$$ is heated to final temperature $$T_1$$. As a result of the heating, the rod expands to length $$l_1$$. The change in length is:$$\Delta l ~=~ l_1 - l_2$$

The greater the coefficient of thermal expansion $$\alpha$$ of the metal, the more the metal rod expands.