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NCERT Exemplar Solutions Class 9 Science Solutions for Matter in our Surroundings - Exercise in Chapter 1 - Matter in our Surroundings

Question 20 Matter in our Surroundings - Exercise

A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.

Answer:

Graph (a) is the right answer because water will cool initially until its temperature reaches 0 °C. After reaching the freezing point (0 °C) temperature will remain constant until the water becomes ice. After that point temperature would decrease again.

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