Question

Explain melting and freezing according to states of matter.

Answer 1

Melting:

• The change in the solid to liquid phase at a constant temperature is called melting (or fusion).
• The temperature at which melting occurs is called the melting point of the solid.
• Heat is released from the solid in this process.
• Examples: Ice cubes when taken out from the freezer and placed at room temperature, it changes into a liquid, so here ice cubes melt to form water.

Freezing:

• The change in the liquid to the solid phase at a constant temperature is called freezing.
• The temperature at which liquid changes to solid is called the freezing point.
• Example: water-filled in an ice cube tray, when kept in the freezer, changes into solid, so here the water freezes to form ice cubes.

Therefore, when solids change into a liquid called melting, and when liquid changes into solid ice called freezing.