A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < $0^{\circ}$ C). If you could measure the temperature of the content of the tumbler, which of the graphs as shown in figure would correctly represent the change in its temperature as a function of time ?

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Solution

Figure (a).
The temperature of water falls to 0°C first. Then it will be constant till all water turn into ice, then it will decrease.

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Figure (a). The temperature of water falls to 0°C first. Then it will be constant till all water turn into ice, then it will decrease.

Figure (a).
The temperature of water falls to 0°C first. Then it will be constant till all water turn into ice, then it will decrease.