Question #3f382

Mar 27, 2017

The glass rod smoothens so as to minimize the surface area. This is because, lesser surface area corresponds to less surface energy.

Explanation:

When the glass rod is heated enough, the constituent particles loosen enough so that there can be distortions in the macroscopic structure.

Since, all systems tend to minimize the energy to approach equilibrium, the glass rod smoothens in order to minimize the surface area and hence the surface energy.