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  4. If the temperature difference on the two sides of a wall increases from 100° C to 200° C , its thermal conductivity

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Q. If the temperature difference on the two sides of a wall increases from $ 100{}^\circ C $ to $ 200{}^\circ C $ , its thermal conductivity

Rajasthan PMTRajasthan PMT 2007Thermal Properties of Matter

Solution:

The coefficient of thermal conductivity of a material is the amount of heat flowing in $ 1\,\,s $ through a rod of that material of $ 1\,\,m $ length and $ 1\,\,{{m}^{2}} $ area of cross-section in the steady state; when the difference of temperatures between the two ends of the rod is $ {{1}^{o}}C $ and the flow of heat is normal to the end faces of the rod. Coefficient of thermal conductivity $K$ is a constant, whose value depends upon the material of the rod. Hence, even if temperature increases or decreases, its thermal conductivity remains unchanged.