➢ The process of changing a liquid (solidification) into a solid by cooling is called freezing.
➢ When a liquid is cooled, its particles lose energy due to which they move slowly.
➢ If the liquid is cooled enough (upto freezing point) its each particle stops moving and vibrates about a fixed position. At this stage the liquid freezes and becomes a solid.
➢ Freezing is the reverse of melting.
➢ Freezing means solidification from above discussion, we conclude that state of matter can be changed by changing the temperature.
