what is happen in molecol while expansion a solid?

Question

what is happen in molecol while expansing a solid?

Answer 1

The density of a solid or liquid is determined by the various kinds of intermolecular bonds, see the reference. These bonds tend to attract a molecule to its neighbors. The molecules tend to keep getting closer until the electrostatic repulsion between the positively charged nuclei equals the attraction.

As you increase the temperature, nothing changes within a molecule, the molecules just move more. In a solid, they generally stay in place and vibrate with respect to their neighbors. The repulsive force is inverse square with distance, so as molecules get closer, the repulsive force increases rapidly. Thus, the vibrations involve more movement away from the neighbors than toward the neighbors. That's why the average distance between molecules increases with temperature.

Rarely, other factors dominate. As water cools, it contracts until it reaches about 39 degrees F, and then starts expanding.

Answer 2

When a solid starts expanding, the molecules start moving faster due to increased kinetic energy. Thus, there are more collisions causing greater spaces between the molecules. Hence, the solid slowly becomes a liquid.

Hope that helps!

Answer 3

when a solid expands, the inter molecular separation of the molecules increases since they get more kinetic energy. this is so because during expansion, the temperature of the solid increases hence increasing the internal energy of the molecules.
the molecules vibrate more vigorously gaining more knetic energy while increasing inter-molecular separation.