Note this is the same curve as above

From C to D : increasing the energy increases the motion of the particles in the liquid so the temperature of the liquid increases.

From D to E : forces of attraction between liquid particles weakens to particles start to move away from each other . there is no temperature change as the energy supplied is used to break the forces between the particles , the substance boils .

From E to F : increasing the energy increases the speed of the gas particles . so the temperature increases and the gas particles are getting far away from each other.

Cooling Curve

Almost opposite is happening

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Heating and cooling curves

Heating and cooling curves