Question

why does mater undergo expansion on heating?​

Answer 1

Answer:

All three states of matter (solid, liquid and gas) expand when heated. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquids

Answer 2

Answer:

Because of molecule vibration

Explanation:

As heat is supplied to the matter, the energy is transferred from the heat to the molecules. As the molecules have to use the energy they start vibrating as a result transferring some of the energy to the other molecules

Resulting in expansion