Lesson 11 Summary
- On heating, the particles of a substance move faster and move further
apart so that the substance expands on heating. - The increase in any one dimension of a solid is called linear expansion.
- For modest temperature changes, experiments show that the change
in length ($\Delta L$) is directly proportional to the change in temperature
($\Delta T$) and the initial length of the rod Lo. $\Delta L \propto L_0 \Delta T$ , where $\propto$ is
coefficient of linear expansion.