While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that

Question

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that, convection may be stopped, radiation may be stopped, heat conduction is easier downwards, it is easier and more convenient to do so

MARKS App · Accepted Answer

Natural convection in liquid occurs because of difference in density and is always in vertical direction. Therefore if we keep the upper part hot (lower density) and lower part cool (higher density) then heat transfer is because of conduction only.

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