Question

why does a solid on heating gets converted to a liquid

Answer 1

MELTING. When a solid is heated, the particles are given more energy and start to vibrate faster. At a certain temperature, the particles vibrate so much that their ordered structure breaks down. At this point the solid melts into liquid.

Answer 2

The solid changes into liquid by the process of melting.When the solid is heated,its temperature increases.The kinectic energy of the particles will also increase and will start vibrating about their positions.