Question

Mention the changes that take place when a solid is heated.

Answer 1

The changes that take place when a solid is heated (increase in temperature) are as follows:

• On increasing the temperature of solids, the Kinetic Energy (K.E.) of particles increases.
• Due to an increase in Kinetic Energy(K.E.), the particles start vibrating with greater speed.
• The energy supplied by heat overcomes the force of attraction between the particles.
• Then, the particles leave their fixed positions and start moving freely, and thus solid melts.

Thus melting of solids takes place.

Melting or Fusion: The process due to which a solid change into a liquid state by absorbing heat energy is called melting or fusion.