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  • 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)

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.

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Sol.

When hot water tumbler is kept in freezer, the temperature of water decreases as it loses energy to the freezer. The decrease in temperature of water goes up to 0°C. The water still loses energy to refrigerator as its temperature is less than 0°C, but this loss of energy will change the phase of water and it get converted in ice.

 Till the time all water get converted in ice, temperature remained constant at 0°C.

After complete formation of ice, the ice will cool down to lower temperature until it equates with temperature of refrigerator.

Hence, the correct graph of temperature is given in option A.

Posted by

Gurleen Kaur

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