Explain why the experiment to determine the thermal conductivity of a metal, the specimen is made thin and long.

• Gradient Establishment: A thin and long specimen ensures a well-defined temperature gradient along its length. This is crucial because thermal conductivity is measured based on the heat flow along the temperature gradient.
• Reduced Heat Loss: A thinner specimen minimizes lateral (side) heat loss, ensuring that most of the heat flows along the length of the specimen. This reduces errors and improves the accuracy of the experiment.

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