12.3 Explain why

(a) Two bodies at different temperatures T1 and T2 if brought in thermal contact do not necessarily settle to the mean temperature (T1 + T2 )/2.

 

(b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.

 

(c) Air pressure in a car tyre increases during driving.

 

(d) The climate of a harbor town is more temperate than that of a town in a desert at the same latitude.

<p><strong> (a)</strong> When the two bodies at different temperatures brought in contact, heat flows from the body of higher temperature to the body with lower temperature till the thermal equilibrium is achieved and both the body attains the temperature of (T1 + T2 )/2. But only when the thermal capacities of both the bodies are equal.</p><p>&nbsp;</p><p><strong> (b)</strong> The coolant used in Chemical or in Nuclear plant should have high specific heat. Higher specific heat allows coolant to absorb more heat.</p><p>&nbsp;</p><p><strong> (c)</strong> In motion, the air temperature inside the tyre increases due to the motion of the air molecules. According to Charles's law, temperature is directly proportional to pressure. Hence, the air pressure inside the tyre also increases.</p><p>&nbsp;</p><p><strong> (d)</strong> A harbor town has a temperate climate ( without extreme heat or cold) than a town located in a desert at the same latitude. This is because the relative humidity in a harbor town is more than it is in a desert town.</p>

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