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Q.
A block of ice at temperature - 20$^{\circ}$C is slowly heated and converted to steam at 100$^{\circ}$C. Which of the following diagram is most appropriate?
Thermal Properties of Matter
Solution:
The ice at - 20$^{\circ}$C converts to ice at 0$^{\circ}$C, thus having an increase in temperature. On further heating, ice at 0$^{\circ}$C is converted into water at 0$^{\circ}$C, thus the temperature remaining constant, a change of phase occurs.
Water at 0$^{\circ}$C when heated changes to water at 100$^{\circ}$C, thus resulting in an increase of temperature.
Water at 100$^{\circ}$C changes to steam at 100$^{\circ}$C, thus resulting in a change of phase.