Experiment:

i) Take a few ice cubes in a beaker and heat it using a burner. Suspend a laboratory thermometer into the beaker with the bulb in contact with the ice cubes to monitor the increase in temperature.

ii) As the temperature increases, the ice cubes start to melt and get converted into liquid water.

iii) Upon further increase in temperature, the water starts to boil and gets converted into gaseous water vapour.

Explanation: Increase in temperature causes an increase in the kinetic energy possessed by the particles. The increased kinetic energy starts breaking the intermolecular forces of attraction in solid ice and converts it into liquid water with more intermolecular space. Further, increase in the temperature results in a greater increase in the kinetic energy of liquid water particles which in turn get converted into their gaseous state and evaporate.