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Question
Q9. Explain the time-temperature graph of water depicted below? [3 marks]
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Solution
From the graph, we can see that as we provide heat the temperature of ice increases from –40 °C and reaches 0 °C, at point A.
On further heating, the ice completely melts at 0 °C and converts into water at this constant temperature represented by line AB.
After this, the temperature of the water starts increasing and it reaches 100 °C, at point C.
At this point, steam formation starts taking place and the water gets completely converted to steam at a constant temperature of 100 °C represented by the line CD. [2 marks]
The heat absorbed at constant temperatures, represented by the lines AB and CD is known as latent heat of fusion and latent heat of vapourization respectively. [1 mark]
On further heating, the ice completely melts at 0 °C and converts into water at this constant temperature represented by line AB.
After this, the temperature of the water starts increasing and it reaches 100 °C, at point C.
At this point, steam formation starts taking place and the water gets completely converted to steam at a constant temperature of 100 °C represented by the line CD. [2 marks]
The heat absorbed at constant temperatures, represented by the lines AB and CD is known as latent heat of fusion and latent heat of vapourization respectively. [1 mark]
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