Class 9 Chemistry Matter In Our Surroundings Change of state of matter

Change of state of matter due to effect of temperature

We are already aware of the fact that kinetic energy of the particles of a matter increases with the increase in temperature. Due to this increase in kinetic energy the particles start to vibrate with greater speed. The energy provided by the application of heat breaks the force of attraction between the particles and as a result the particles leave their respective position and starts moving freely.

A phase is reached where at certain temperature solid gets converted to liquid. This temperature at which a solid melts and converts into liquid at atmospheric pressure is termed as melting point.

Fig. Melting of ice on application of heat

Particles of water possess greater kinetic energy at 0oC. On application of more heat the particles of water starts moving faster. At specific temperature the particles acquire enough energy to break free from the forces of attraction of each other. At this temperature the liquid starts changing into gas. This temperature at which a liquid starts boiling and starts converting to gas at the atmospheric pressure is called boiling point.

Fig. boiling of water

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