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Why is the bottom of cooking vessel made...

Why is the bottom of cooking vessel made of steel, coated with copper?

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Thermal conductivity of steel is `50Wm^(-1)K^(-1)` whereas it is `385Wm^(-1)K^(-1)` for copper. Copper promotes uniform distribution of heat to the bottom of the vessel.
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SUBHASH PUBLICATION-THERMAL PROPERTIES OF MATTER-TWO MARKS QUESTION AND ANSWERS
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  3. Define thermal conductivity. Write its SI unit.

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  4. Why is the bottom of cooking vessel made of steel, coated with copper?

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  11. Solar water heaters use cadmium black as a coating material on copper ...

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