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While measuring the thermal conductivity of liquids, the upper part is kept hot and lower one cool so that:

1. convectional flow is stopped
2. radiation is stopped
3. conduction is easier
4. it is easier to perform the experiment

Correct answer: convectional flow is stopped

Solution

In a liquid, if the lower part is hotter, the less dense warm liquid rises and convection currents form. By keeping the upper part hot and the lower part cool, the denser liquid stays below the lighter liquid, so convection is suppressed and heat transfer is mainly by conduction.

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