Question

Why does a solid change to liquid when heat is added

Answer 1

melting. The particles in a solid are held tightly and packed close together to strong forces of attraction acting between them and still they are vibrating. But this doesn't disrupt or break the structure.

Answer 2

Answer: It is due to the change in the position of the molecules of the solid substance.

Step-by-step explanation:

All solid substances contains molecules that are tightly packed together. When heat is applied to this solid substances, the molecules of the substance tends to vibrate away from their mean fixed position as such causes a change in the state of the solid matter into a liquid. The process by which a solid changes to liquid is known as Melting or Fusion