# Why Air pressure in a car tyre increases during driving ?

Explain why:

(a) Air pressure in a car tyre increases during driving ?

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

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

(d) The climate of a harbour town has more temperature (i.e. without extremes of heat and cold) than that of a town a desert at the same latitude, why?

Sol:

(a)Temperature of air inside the tyre increases due to motion during driving. Air pressure therefore, increase inside the tyre (by Charle’s law, P ∝ T)

(b)In thermal contact, heat from the body at higher temperature transfers to the body at lower temperature, till temperature of both becomes equal. Final temperature can be mean temperature. (T1+T2)/2 only when thermal capacities of two bodies are equal.

(c)Because heat absorbed ∝ specific heat of substance.

(d)In a harbour town, the relative humidity is more than in a desert town. Hence, the climate of a harbor town is without extreme of hot and cold.

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