Answer:
The spacing between particles increases.
Explanation:
Solids is the state of matter in which the atoms of the matter are closely packed by the strong forces.
When solid is converted to liquid, these force has to be broken in order for the conversion to take place.
Thus, on heating the molecules gain energy and posses kinetic energy and start vibrating and moving. This energy overcome the forces of attraction and the spacing of the atoms decreases and turns into liquid.
