The diagram below shows a rod made of wood on one end and metal on the other end suspended freely with a piece of thread so that it is in equilibrium
![rod of wood and metal](https://www.easyelimu.com/images/form_3_past_papers/Term_1_2021/rod_of_wood_and_metal.JPG)
The side made of the metal is now heated with a Bunsen flame. State with reason the side to which the rod is likely to fit