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Heating of Ice

Fig. 11.1 refers unit mass of ice at- 20°C under one atmospheric pressure. Let us increase the temperature of the ice under constant pressure and observe. We see the following (Refer Fig. 11.2)

Process 1-2 : The temperature of ice increases from- 20°C to 0oc and there is a small change of volume. The ice is now at 0°C.

 

Process 2-3 : The solid ice at 0oc starts melting to liquid without any change in temperature. There is a decrease in volume.

 

Process 3-4: The temperature of the liquid water at 0°C increases to 100°C. The volume decreases to a minimum at 4°C and then increases upto point 4.

 

Process 4-5 : The liquid water at l00°C starts boiling to a vapour or gas at constant temperature with a large increase in volume.

 

Process 5 onwards : Both the temperature and volume of the vapour increases.

 

Note. The decrease in volume during melting is a peculiarity of water.